Plus that account wasn't active for like 2/3 years at that point and it doesn't seem reasonable that I would log back into the account and send some malware (or any mining-related links)...
It doesn't make much sense indeed, but we've seen people doing some pretty stupid things so lack of logic behind it is not much of an argument. Not saying that you did it btw.I don't have any proof that my account was hacked, neither I have any email regarding changing email address/password
I just went through Report Malware and Suspicious Links here so Mods can take Action ! thread (that's where malware links and accounts spreading them are shared) a little bit and I found more examples of accounts waking up, not changing pass/email, spreading malware and getting banned so maybe those behind it don't actually bother with changing those because they know that account will get banned anyway so what's the point. Anyway, you might wanna look into that thread more thoroughly and look for some arguments if you decide to appeal via email. 
