Yup.
From what i have heard, What.cd is pretty selective in who they keep around (ie. if you don't have good ratios your kicked). So it might just be that a guy was attempting to download something from you, or even uploading something specifically to you. No idea. But the chances of a guy trying to infiltrate your PC is slim. I'd still block the punkass though.

2 TB? Nice. What are you total system specs?
Do you know how i would get into a private torrent site like what.cd ?