Over the past two days, we have been receiving fake LinkedIn invitations. These are email worms similar to the fake twitter and fake facebook invitations going around.
These are devious. The email you receive contains links. Those links usually redirect to another site and that site may redirect to another. That site loads up an iframe, which loads itself from yet another site. Some of those refresh to yet another site, the URL of which looks like a link to a fake antivirus scanning and sales site.
Many of the destination sites we investigated were in India, using Indian domains, but the multiple scanning sites were in Latvia, with another site in India used for statistics.
The purpose of all these redirects is to protect the main site from being banned in email programs and being easily discovered and shut down by the hosting service provider.
Always be careful when clicking links in emails, even if you think the message came from a site or person you know and trust. The aim of the spammers and hackers is to leverage your trust for those sites or those people, to get you to take the action they want you to take. This action can compromise your computer, your reputation or your bank account, so please be careful.