BE CAREFUL and don't blindly follow ~ecpyugioh1's link above. It sends you to a site that is NOT deviantart but mimics the interface and prompts you to log in. Great way to give someone your account login info on a silver platter. BEWARE!
Yeah, I am not sure how this deviation with as few comments as it had ended up on the front page. By the looks of things this account was either just created (only 1 week old) to be a hacking/phishing puppet with (stolen) art in it to make it look legit, or it started out as an art thief's account but fell prey to the phishing links.
I would not worry. The D8 Admins will be able to work it out. Just let them know directly if you haven't already and they will look into it. Might be worthwhile asking them to track the posts the Hacker may have made.