Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efdb437ca8cb823…

MALICIOUS

PDF

18.6 KB Created: 2019-04-30 02:37:18 +01:00 Authoring application: mPDF 5.7
MD5: 103ab1b4ef7eb58429827c74a1516140 SHA-1: dbc2b45c33989494d41f63fab788f038ecb7adb9 SHA-256: 6efdb437ca8cb8231021e77c5d6c76d3849a9efa163f444ab652b8a174647a93
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, forming a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While the URLs themselves are currently marked as benign, the overall structure and heuristic firings suggest an attempt to direct users to external content, potentially as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://muicuiu.dumb1.com/4a08a05a02a01a09/Bone-on-Bone-Bell-Elkins-7-by-Julia-Keller.pdf
    • http://muicuiu.dumb1.com/1a09a01a01a00a05/A-Killing-in-the-Hills-Bell-Elkins-1-by-Julia-Keller.pdf
    • http://muicuiu.dumb1.com/2a01a03a00a05a06/The-Children-of-the-Red-King-Books-1-5-Midnight-for-Charlie-Bone-Charlie-Bone-and-the-Time-Twister-Charlie-Bone-and-the-Invisible-Boy-Charlie-Bone-and-the-Castle-of-Mirrors-and-Charlie-Bone-and-the-Hidden-King-by-Jenny-Nimmo.pdf
    • http://muicuiu.dumb1.com/4a07a01a05a02a09/Bone-Broth-Bone-Broth-Diet---Lose-Weight-Fight-Inflammation-and-Improve-Your-Health-with-Delicious-Bone-Broth-Recipes-Bone-Broth-Diet-Book-2-by-Andrew-Mills.pdf
    • http://muicuiu.dumb1.com/1a08a04a02a05a09/Bone-Vol-8-Treasure-Hunters-Bone-8-by-Jeff-Smith.pdf
    • http://muicuiu.dumb1.com/4a04a02a04a03/Bone-Vol-2-The-Great-Cow-Race-Bone-2-by-Jeff-Smith.pdf
    • http://muicuiu.dumb1.com/6a05a09a05a09/Bone-Vol-4-The-Dragonslayer-Bone-4-by-Jeff-Smith.pdf
    • http://muicuiu.dumb1.com/1a08a04a02a06a01/Bone-Vol-6-Old-Man-s-Cave-Bone-6-by-Jeff-Smith.pdf
    • http://muicuiu.dumb1.com/3a05a09a03a06/Bone-Vol-1-Out-from-Boneville-Bone-1-by-Jeff-Smith.pdf
    • http://muicuiu.dumb1.com/3a04a05a07a07a08/Bone-Black-Memories-of-Girlhood-by-bell-hooks.pdf
    • http://muicuiu.dumb1.com/4a09a01a07a00a08/Bone-By-Bone-by-Carol-O-39-Connell.pdf
    • http://muicuiu.dumb1.com/5a00a04a07a02a09/The-Bone-Field-The-Bone-Field-1-DI-Ray-Mason-2-by-Simon-Kernick.pdf
    • http://muicuiu.dumb1.com/2a01a05a06a08a09/Bone-by-Bone-by-Sanjida-Kay.pdf
    • http://muicuiu.dumb1.com/4a07a01a01a05a03/The-Bone-Season-The-Bone-Season-1-by-Samantha-Shannon.pdf
    • http://muicuiu.dumb1.com/8a02a00a04a07/The-Bone-Season-The-Bone-Season-1-by-Samantha-Shannon.pdf
    • http://muicuiu.dumb1.com/2a06a06a06a06a00/The-Bone-Season-The-Bone-Season-1-by-Samantha-Shannon.pdf
    • http://muicuiu.dumb1.com/4a02a06a04a00a05/Bone-Grace-Bone-Grace-1-by-Kathryn-Purdie.pdf
    • http://muicuiu.dumb1.com/5a07a05a01a07/The-Bone-Season-The-Bone-Season-1-by-Samantha-Shannon.pdf
    • http://muicuiu.dumb1.com/3a04a03a02a04a04/The-Bone-Ritual-The-Bone-Ritual-1-by-Julian-Lees.pdf
    • http://muicuiu.dumb1.com/6a05a03a07a07a01/The-Bone-Season-The-Bone-Season-1-by-Samantha-Shannon.pdf