We could certainly look into this if there is demand. For now you could run the tests from the source code - the only difference is that it won't report the results back to the website and you won't have the pretty report.

+1 for this request. It would be nice to be able to run this for raspberry pi's

Building from source on a raspberry pi has been problematic for me. I have been getting errors on not being able to open threads when trying to run the code. I am certain it is most likely my setup but it would be nice not to have fight through these types of issues to get meaningful value out of the software for these types of environments.

You can build arm64 images as follows on your current x86 Linux environment:

Install the qemu-user-static package for your system which should include qemu-aarch64.
Then maybe do a sudo systemctl restart systemd-binfmt.service depending on your distribution.

Verify that Docker can now start ARM images:

docker run --rm arm64v8/python:3.7-alpine3.10 python3 -c 'print("hi")'

Run git apply, paste the following and press Ctrl-D to temporary select the ARM Python base Docker image explicitly:

diff --git a/Dockerfile b/Dockerfile
index e1d56aa..2ff7eef 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.7-alpine3.10 as builder
+FROM arm64v8/python:3.7-alpine3.10 as builder
 
 RUN apk add --no-cache \
     linux-headers \
@@ -12,7 +12,7 @@ RUN pip install -r /kube-hunter/requirements.txt -t /kube-hunter
 
 COPY . /kube-hunter
 
-FROM python:3.7-alpine3.10
+FROM arm64v8/python:3.7-alpine3.10
 
 RUN apk add --no-cache \
     tcpdump

Then build the Docker image as usual but tagged with a -arm64 suffix, i.e., aquasecurity/kube-hunter:latest-arm64.
Also retag the regular x86 image with a -amd64 suffix. Push both.

Now make sure you have "experimental": "enabled" in your ~/.docker/config.json (surrounded by { and } if the file is otherwise empty).

When all images are built on the respective architectures and pushed they can be combined through a manifest to build a multiarch image:

docker manifest create aquasecurity/kube-hunter:latest --amend aquasecurity/kube-hunter:latest-amd64 --amend aquasecurity/kube-hunter:latest-arm64
docker manifest annotate aquasecurity/kube-hunter:latest aquasecurity/kube-hunter:latest-amd64 --arch=amd64 --os=linux
docker manifest annotate aquasecurity/kube-hunter:latest aquasecurity/kube-hunter:latest-arm64 --arch=arm64 --os=linux
docker manifest push aquasecurity/kube-hunter:latest

+1 for this request.
/cc @lizrice