Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9f1cedec784832…

MALICIOUS

PDF

13.3 KB Created: 2019-04-30 03:11:40 +01:00 Authoring application: mPDF 5.7
MD5: f26827f6c0bf14d9cbd7ffa8da5b1682 SHA-1: 5ef635afcd3ce9b1e169c565186629b3ca67765e SHA-256: 8a9f1cedec784832c067aaf8f3cc41f70efe4763aecebece426604b81c90ffee
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier also flagged the document as malicious. While no scripts were extracted, the sheer volume of links points to a malicious intent, likely to drive traffic to malicious sites or to manipulate search results. The URLs themselves appear benign in isolation, but their aggregation within the PDF is suspicious.

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/7a09a04a06a09a04/Vengeance-Be-Mine-Vengeance-Demons-1-by-Louisa-Lo.pdf
    • http://muicuiu.dumb1.com/3a05a07a02a07a07/Vengeance-is-Mine-by-Zada-Leon.pdf
    • http://muicuiu.dumb1.com/4a02a02a08a01a04/Vengeance-is-Mine-An-Emily-O-Brien-Novel-1-by-M-R-Miller.pdf
    • http://muicuiu.dumb1.com/3a04a01a00a02a01/A-Good-Thing-Vengeance-is-Mine-by-She-Nell.pdf
    • http://muicuiu.dumb1.com/2a01a08a08a08a08/Vengeance-is-Mine-Children-of-Adam-Vol-1-by-Lon-Widdicombe.pdf
    • http://muicuiu.dumb1.com/6a05a02a06a00/Vengeance-Road-Vengeance-Road-1-by-Erin-Bowman.pdf
    • http://muicuiu.dumb1.com/3a05a02a04a06a01/Sin-and-Vengeance-by-C-J-West.pdf
    • http://muicuiu.dumb1.com/7a09a04a06a02a00/Vengeance-by-Susan-Lewis.pdf
    • http://muicuiu.dumb1.com/3a00a04a01a03a07/Howling-Vengeance-by-H-M-Clarke.pdf
    • http://muicuiu.dumb1.com/3a05a01a00a03a09/Vengeance-Jet-3-by-Russell-Blake.pdf
    • http://muicuiu.dumb1.com/4a02a05a01a01a03/God-of-Vengeance-by-Sholem-Asch.pdf
    • http://muicuiu.dumb1.com/1a08a00a05a02a01/Run-Vengeance-1-by-Gregg-Olsen.pdf
    • http://muicuiu.dumb1.com/3a07a00a01a05a01/The-Vengeance-of-Wol-by-Joan-Seager.pdf
    • http://muicuiu.dumb1.com/4a02a05a08a03a09/Vengeance-of-the-Werewolf-by-Mercedes-Fox.pdf
    • http://muicuiu.dumb1.com/2a04a08a04a03a01/It-Can-t-Be-You--A-Spiral-of-Vengeance-by-Prem-Rao.pdf
    • http://muicuiu.dumb1.com/7a09a04a05a01a00/Day-of-Vengeance-by-Bill-Willingham.pdf
    • http://muicuiu.dumb1.com/1a01a07a05a04a07a07/Slow-Vengeance-by-John-Bude.pdf
    • http://muicuiu.dumb1.com/2a05a09a07a01a09/One-Woman-s-Vengeance-by-Dennis-R-Miller.pdf
    • http://muicuiu.dumb1.com/3a07a06a04a07a06/Blood-Vengeance-by-Teresa-Keefer.pdf
    • http://muicuiu.dumb1.com/4a09a03a02a07a07/Path-To-Vengeance-The-Guardians-1-by-W-H-Cann.pdf

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