The domain is www.behappy2day.com
Here is the example when I try to open a picture from the site which is blocked
Website blocked due to a suspicious download
Download blocked: https://www.behappy2day.com/img/virt_gift/111.png
Malwarebytes Browser Guard blocks downloads that either come from websites that see relatively light traffic or may contain potentially malicious content. This is intended to protect you from new scams. However, if you trust content from this site and would like to proceed, click "Continue."
It's a regular png (or webp when supported). Maybe the name triggers the browser guard?