Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1fc2e69763e453…

MALICIOUS

PDF

13.5 KB Created: 2019-05-07 03:15:47 +01:00 Authoring application: mPDF 5.7
MD5: 3a764ef42acf29332952b4b469c91133 SHA-1: cda8d30dac9b96df2a6e7215c35a53c11c13850a SHA-256: db1fc2e69763e4535b04c9d479564e9171eb34a5b1b94a5b5ff386b551c6b5eb
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to external PDF documents, a technique often used for SEO poisoning or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was heavily obfuscated, but the presence of a link farm strongly suggests a malicious intent to redirect the user. The primary IOCs are the URLs forming the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9102

Heuristics 2

  • 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.
  • 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/1a02a00a07a09a02/Her-Best-Friend-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/2a01a07a02a02a05/Within-Reach-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/4a08a00a05a01a07/Home-for-the-Holidays-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/3a00a05a02a03a04/One-Good-Reason-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/4a05a09a04a01a07/Satisfaction-Brothers-Ink-1-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/6a08a05a09a01a05/Plaisirs-interdits-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/2a01a01a07a07a07/The-Best-Laid-Plans-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/2a01a06a04a00a08/One-Good-Reason-Adamson-Brothers-2-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/2a01a06a03a07a06/Take-on-Me-Secret-Lives-of-Daytime-Divas-1-by-Sarah-Mayberry.pdf
    • http://muicuiu.dumb1.com/1a00a01a00a00a03a03/Taekwondo-Kids-From-White-Belt-to-Yellow-Green-Belt-by-Wolfgang-Rumpf.pdf
    • http://muicuiu.dumb1.com/1a01a06a01a09a05a04/abbreviations-mayberry-by-george-mayberry.pdf
    • http://muicuiu.dumb1.com/2a06a02a08a05a06/Mellifica-Wait-for-Me-bk-2-by-Melissa-Mayberry.pdf
    • http://muicuiu.dumb1.com/4a03a02a07a01a09/Below-the-Belt-Bannon-s-Gym-1-amp-2-by-Cat-Grant.pdf
    • http://muicuiu.dumb1.com/7a03a02a06a05a04/Think-Like-a-Black-Belt-by-Jim-Bouchard.pdf
    • http://muicuiu.dumb1.com/8a03a03a05a06a06/The-Troll-s-Belt-by-J-M-Ney-Grimm.pdf
    • http://muicuiu.dumb1.com/6a03a09a06a07/The-House-on-Mayberry-Road-by-Troy-McCombs.pdf
    • http://muicuiu.dumb1.com/1a06a07a05a05a06/Under-Orion-s-Belt-by-Remi-Wild.pdf
    • http://muicuiu.dumb1.com/4a02a06a06a07a00/Orange-Belt-by-Faye-McCray.pdf
    • http://muicuiu.dumb1.com/3a09a07a06a09a07/Poppy-Mayberry-A-New-Day-Nova-Kids-3-by-Jennie-K-Brown.pdf
    • http://muicuiu.dumb1.com/5a02a03a00a08a04/The-Belt-of-Orion-Nibiru-Rising-by-J-R-Brienza.pdf
    • http://muicuiu.dumb1.com/2a06a02a08a05a06/Mellifica-Wait-for-Me-bk-2-by-Melissa-Mayberry.p

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