Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca67a31315197eb…

MALICIOUS

PDF

26.0 KB Created: 2020-11-07 22:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 051e790654147e881831f86c40dfe57a SHA-1: cbc43b7a27aeab04668149471ee1171a650ce782 SHA-256: 5ca67a31315197eb7325af52e895c36b023e2e69df796132b2e088a015aa82e7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many pointing to WordPress and Strikingly hosted PDFs, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafffi.ru/aws?keyword=nicd+aa+batteries', is directly associated with the document's content and is likely the primary malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://trafffi.ru/aws?keyword=nicd+aa+batteries
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5f9f878cdb5bc.pdf
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f8766a36e885.pdf
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f88cec20aa62.pdf
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f874d156e83d.pdf
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8e92de974ac.pdf
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5fa49b5b801f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bipadibu.files.wordpress.com/2020/11/jolifati.pdf
    • https://xejuritumar.files.wordpress.com/2020/11/fagatimuveweralokebonunag.pdf
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdf
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdf
    • https://uploads.strikinglycdn.com/files/451750f7-16b4-48f0-aff3-76b3aa75b734/bijafepalatugap.pdf
    • https://gopalov.files.wordpress.com/2020/11/zazapemakumijege.pdf
    • https://uploads.strikinglycdn.com/files/80126388-90c6-4b9e-98ea-ce9a9d8c56a0/fishing_guide_tbc.pdf
    • https://tabubiselo.files.wordpress.com/2020/11/51936788582.pdf
    • https://bekovepevim.files.wordpress.com/2020/11/vagegegobusebujudujab.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e69.bin
c7a5bf5ad53dda3a34445dfcc3829eb89c08b9a8a5159a99312a1c1b25b19f24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E69 4584 bytes

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