Hackers are everywhere wether you know it or not they use websites or downloads to hack your computer,phone ot whatever your using. Hackers use websites undercover which make you download things like a cat image when its really a virus.
Websites that are designed by hackers usually force you to download something which is usually a very large file which is usually filled with viruses If you are downloading an image always look at the file size if its way too big for a small image it is probably a virus or a scam.