Is Skydaz Safe?

My friend told me about a site called Skydaz. His exact words were "Hey John, I found this website that has mods that auto-install themselves into Minecraft as soon as you download them to your computer." I said I didn't think it seemed too safe. And neither of us had any clue how to download mods and when I tried getting one from PMC I screwed up my Minecraft (I fixed it now) so I was thinking about trying Skydaz. The next day I wen to my frined's house and as soon as I stepped in the door I saw he was attempting to play Minecraft on his old, slow laptop instead of his Dad's new, fancy computer which he usually plays on since his is old, slow, and doesn't have much space to play games. I asked him why he was playing on his and he told me he tried Skydaz. Then he told me his Dad's computer had a virus. Does anyone know if this was because of Skydaz or something else? Thanks.