So I checked the recent changes, and noticed three edits by a new user. The user deleted external links in articles, and inserted ad links in the middle of the articles. There's only three articles that were affected, and I undid the changes. I don't know if there's a report function, or something, so I thought I'd post here. I'm reasonably sure I don't have the authority to block the user or an IP.
While this was a minor occurrence, it did happen in the middle of the night (US time). Given the small amount of editors still working on the wiki, I'm concerned that an actual spam attack in the middle of the night would do a lot of annoying damage. Is there a way to prevent this?