Cybersecurity Stop Of The Month: How Attackers Use Authentication Links To Hide Malicious Intent
Proofpoint, Friday, January 9th, 2026
The Cybersecurity Stop of the Month blog series explores the ever-evolving tactics of today's cybercriminals and how Proofpoint helps organizations better fortify their defenses to protect people against today's emerging threats.  
The scenario: a safe door to a dangerous room
It starts with an email that looks entirely routine. You receive a notification that appears to come from a trusted service-in this example, let's say Dropbox. The email informs you that a colleague has shared a secure file, perhaps an invoice or a spreadsheet titled 'Q3 financials,' and provides a link to view it. The link itself points to a legitimate Dropbox URL. There is no malware attached to the email. To any standard email security filter, this message looks clean.