Two recent stargazers are http://archive.is/cbPm1 and http://archive.is/o0uzH; both accounts are in "cn" and use an email address with an invalid TLD.
Another two, http://archive.is/x5IBA and http://archive.is/KUnOg, have less "definitely spam" indicators; the only thing they have in common is that x64dbg is the only repo they've starred, that they have no other activity, and that they were created ~two days ago.
Have fun poking through the stargazer list.
I'm very curious as to explanations. Right now I'm not sure whether to wonder if this HN submission is a stargazer-generating demonstration or if I'm just seeing normal github activity (where "normal" means "spammers doing their weird thing").