Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f939d7cb38c76ab…

MALICIOUS

PDF

18.2 KB Created: 2019-05-06 16:29:35 +01:00 Authoring application: mPDF 5.7
MD5: 90a7c37e24e44938b474ede280c8ebf1 SHA-1: 641ce714002c69a10914278346dc09a06c54e03f SHA-256: 5f939d7cb38c76abde5522aff359c0910ae742beb5e8f7f8932b56c49006abbf
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. While the ML classifier flagged it as malicious with high confidence, the specific intent beyond link distribution is unclear as no executable scripts were found. The presence of a 'download button' lure further supports a malicious workflow, likely aiming to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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/3a02a03a08a01a03/The-Marquis-Secret-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/1a00a00a02a04a01a08/The-Princess-and-the-Goblin-by-George-MacDonald-Children-s-Fantasy-Novel-Illustrated-by-Jessie-Willcox-Smith-September-6-1863---May-3-1935-Was-One-of-the-Most-Prominent-Female-Illustrators-in-the-United-States-During-the-Golden-Age-of-American-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/4a02a05a02a00a00/3000-Quotations-from-the-Writings-of-George-MacDonald-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/2a03a06a03a04a04/The-George-MacDonald-Omnibus-The-Princess-and-the-Goblin-The-Princess-and-Curdie-At-the-Back-of-the-North-Wind-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/2a03a09a09a04a04/The-George-MacDonald-Treasury-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/3a08a00a08a08/Phantastes-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/1a09a03a02a06a06/Phantastes-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/9a00a08a05a06a06/Phantastes-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/3a02a04a07a00a00/Flashman-by-George-MacDonald-Fraser.pdf
    • http://muicuiu.dumb1.com/2a03a06a04a09a09/The-Light-Princess-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/2a00a02a08a04a04/The-Light-Princess-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/4a02a05a02a00a06/Phantastes-Lilith-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/1a08a00a05a06a09/The-Princess-and-Curdie-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/8a06a06a02a00/The-Baron-s-Apprenticeship-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/2a00a02a09a07a07/The-Day-Boy-and-the-Night-Girl-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/5a06a06a08a08a01/The-Princess-and-the-Goblin-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/8a03a01a01a01/The-Laird-s-Inheritance-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/7a09a05a03a04/The-Light-Princess-by-George-MacDonald.pdf
    • http://muicuiu.dumb1.com/2a09a04a07a04a02/McAuslan-in-the-Rough-by-George-MacDonald-Fraser.pdf
    • http://muicuiu.dumb1.com/2a06a08a03a03a03/At-the-Back-of-the-North-Wind-by-George-MacDonald.pdf

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