Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4cbed7513de941…

MALICIOUS

PDF

17.1 KB Created: 2019-05-06 16:43:24 +01:00 Authoring application: mPDF 5.7
MD5: f8b816409e8791466b360c93419b2f8a SHA-1: 2e5ad1135457fb7e9e930eb48d3caec2ac4e291f SHA-256: 8a4cbed7513de941dac079b7620d72bcb9ea384759cf3abdfe909ec7a0a4b124
90 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a large number of embedded links, identified as a PDF_SEO_LINK_FARM heuristic. These links point to various PDF documents, many of which are confirmed benign, but the sheer volume and the nature of the heuristic suggest a malicious intent to manipulate search engine results or drive traffic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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/6a08a02a06a03a03/Voltaire-s-Adventures-Before-Candide-by-Martin-D-Gibbs.pdf
    • http://muicuiu.dumb1.com/6a01a09a04a03a00/Voltaire-s-Excellent-Adventure-The-Broken-Boarder-by-Martin-D-Gibbs.pdf
    • http://muicuiu.dumb1.com/7a05a01a01a09a00/Voltaire-10-Romane-u-a-Candide-Die-Prinzessin-von-Babylon-Mikromegas-Skarmentados-Reisen-Der-Wei-e-und-der-Schwarze-Wie-s-in-der-Welt-geht-Jeannot-Colin-Der-Hurone-Zadig-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/6a08a02a07a08a08/Voltaire-s-Candide-and-the-Critics-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/7a05a01a01a09a03/Works-of-Voltaire-20-works-Candide-Zadig-Philosophical-Dictionary-selected-poetry-amp-more-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/9a03a07a02a03a05/Candide-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/2a07a01a05a01a04/Candide-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/5a03a02a05a05a06/Candide-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/8a08a09a02a07a09/Candide-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/3a04a09a01a02a06/Candide-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/4a04a01a08a04a07/Candide-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/9a01a02a03a05/Candide-or-Optimism-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/6a08a02a06a03a07/Candide-and-Other-Works-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/1a00a04a01a08a09a02/Candide-with-eBook-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/8a03a04a07a01a05/Candide-The-best-of-all-possible-worlds-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/3a01a04a06a06a05/Candide-and-Zadig-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/6a01a09a04a02a09/Candide-and-Philosophical-Letters-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/1a00a04a06a01a06a00/Candide-oder-der-Optimismus-by---Voltaire.pdf
    • http://muicuiu.dumb1.com/6a08a02a08a03a03/Candide-Or-the-Optimist-And-Other-Romances-by-Voltaire.pdf
    • http://muicuiu.dumb1.com/6a08a02a07a08a07/The-Erotic-Adventures-of-Candide-by-Martina-Donna-Ramone.pdf

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