I am not sure if this topic belongs to this section or not but I thought this is a critical topic and everyone must be aware of it as it could take away all of the bitcoins stored by you on any exchange, online wallet etc.
This is a phishing scam in which potential victim receives mail during the attack. Many users were sent a deceptive invitation to edit a Google Doc, with a subject line stating a contact "has shared a document on Google Docs with you".
By clicking on that link, victim gives permission to the hacker to access all his emails, data & contacts. Since our online accounts are associated with our mail, hackers can take away our funds (stored on various exchanges / online wallets) by social engineering.
Further information,
*
Google Docs users hit by phishing scam - BBC News.
*
Don't Click on That Random Google Doc Link - The Atlantic.
*
Why the Google Docs scam was a different kind of phishing - CNET.
If you have already clicked on any such link then change your credentials as soon as possible and remove access given to unidentified third party apps of your account.