If I'm not wrong then the method is called as "session hijacking" or "session cookie theft." In such type of attacks the hacker often send you a malicious link, and when a users clicks on the link then the hacker take advantage of the vulnerabilities of the browser that the user is using to access the link. The hacker then steal the session cookies of the user and then use that cookie on his/her browser with the help of extensions like cookie editor. Such type of attacks are often planned by the hackers who have access to some hidden vulnerabilities of the browsers that no-one knows yet. Those hackers can steal session cookies of any website they want, and that way they hack the access of the users.

I'm quite sure that the same thing happened with @Peanutswar when he clicked on that malicious link without even thinking about such exploits. The hacker knew that the user would click on the link, and he would be able to steal the cookies one the user will click the link. It's better to be aware of such type of hacks because they can easily hack someone's account and ask for loans that the user isn't asking for. It's our responsivity to protect ourselves from such type of hacking attacks, and we should never click on the links sent by a unknown user. That way we will be able to protect ourselves from such kind of hacks.