I think this a very bad spam, or fake email I should say. Many people are working hard updating their linkedin account making it look good for jobs, but these days many spam mail from hackers taking advantage of these opportunity and sends people with linkedin fake email that we click on the link and it bring us to either phishing websites or some sites porn sites or sites that have nothing to do with jobs or linkedin information. Stay away from these types of email people, the best way to verify legitimate message is to go into your linkedin website yourself, byt typing in linkedin.com and see if you get any pending messages there.
Sample of fake linkedin mail might tied to, You have new messages, You have potential job waiting, Someone trying to contact you on linkedin, Jobs for you need to respond in 8 hours, and so on. Very bad! The thing about this is people get excited when getting email from linkedin thinking it’s a real jobs offers but just another spam.