Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bb4bbfbe8fb49f…

MALICIOUS

PDF

13.8 KB Created: 2019-11-07 09:31:02 +00:00 Authoring application: mPDF 5.7
MD5: ccdac85fed2372d14fc7ee78a92deb30 SHA-1: 64b3f1d1e54f285d863cd5fab10f2b0ba5032f6e SHA-256: 85bb4bbfbe8fb49f777296d94b2c2cc2b84de245edfd56b641866e4c75caf4f5
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various book titles. While the specific URLs themselves are marked as benign, the sheer volume and structure suggest a malicious intent, possibly for SEO poisoning or as a lure to distribute other content. The ML classifier also flagged the PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://cefasfese.4pu.com/6732733737734731/Astro-Boy-Vol-5-Astro-Boy-5-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6738735733738730/Astro-Boy-Vol-7-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6738735733738739/Astro-Boy-Vol-8-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6738735733739733/Astro-Boy-Vol-11-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/3737733733734739/Astro-Boy-Vols-1-amp-2-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/3737732738736737/Astro-Boy-Omnibus-Volume-1-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6732733737732732/The-Astro-Boy-Essays-Osamu-Tezuka-Mighty-Atom-and-the-Manga-Anime-Revolution-by-Frederik-L-Schodt.pdf
    • http://cefasfese.4pu.com/2734730738730730/Metropolis-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6738735733739734/Atomcat-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/2733738733738/Dororo-Vol-3-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/4734733730738730/The-Four-Encounters-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/2735732731733738/Buddha-Vol-6-Ananda-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6738735733733735/Black-Jack-Vol-14-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/4734733732731736/Black-Jack-Vol-12-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/1731731734736736/Ode-to-Kirihito-Part-1-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6732733737733734/Black-Jack-Vol-10-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6732733737733739/Phoenix-Vol-10-Sun-Part-1-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6732733737732733/Black-Jack-Vol-8-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6738736732735/Phoenix-Vol-4-Karma-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/6732733737733732/Ode-to-Kirihito-Part-2-by-Osamu-Tezuka.pdf
    • http://cefasfese.4pu.com/2735732731733738/Buddha-Vol-6-Ananda-by-Osamu

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