Is it possible to exactly pinpoint the person that did this?
Yes. But you either need to do something illegal (like hack back in search of an identity) or you need to get law enforcement involved (which won't happen in this case).
So getting the real identity of the persons is not worth the effort.
You might have a shot at getting their ISP to help, but it looks like they are using a free Brazilian ISP (I.G.) that will probably not be able to help.
But they gave their email addresses and other contact info. If you want to contact them you can (though I don't recommend it).