Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bfa9ea126c6de5…

MALICIOUS

PDF

41.5 KB Created: 2020-11-09 15:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65e214eeb4ef6bc0de78fcc2686d0ebd SHA-1: 7f64da670ad81dcc33f776a1e06d75a4b71870c8 SHA-256: c5bfa9ea126c6de5c7d2de8915bee6149b50af9bd79b37631364393332f8dc4f
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?keyword=american+vision+textbook+2010+pdf'. The document body, though heavily obfuscated, contains text related to 'American vision textbook 2010 pdf' and the same URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffmen.ru/strik?keyword=american+vision+textbook+2010+pdf
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/4272690.pdf
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5f9dddbfaab53.pdf
    • https://cdn-cms.f-static.net/uploads/4421333/normal_5f9d9a1241855.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/9520944.pdf
    • https://cdn-cms.f-static.net/uploads/4422137/normal_5f97ffe041a42.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7d012ac1-7123-4e54-8a5b-9649f33169a2/dofis.pdf
    • https://uploads.strikinglycdn.com/files/53e8f603-4a86-4c1b-a447-3b16164b5a2f/komobizajabumigetatak.pdf
    • https://uploads.strikinglycdn.com/files/3c7166dd-d821-4a0a-95da-2c3ed0c7a65c/wesivinogededi.pdf
    • https://uploads.strikinglycdn.com/files/1d784024-ebe3-44d5-94c4-42f3d9e3636c/27760604217.pdf
    • https://uploads.strikinglycdn.com/files/bb33fda6-6dd1-4090-aa3e-403e43fec938/silutedowoxewes.pdf
    • https://uploads.strikinglycdn.com/files/e3b62499-6c78-4d4f-82b8-453f93dfd464/61962322027.pdf
    • https://s3.amazonaws.com/xupovobejanam/words_beginning_with_em.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006202.bin
81048997d3cb84ff78fdc77cf1c70d65c985d1c7267cdba4b866e6a8e9ca021e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6202 5916 bytes
font_01_sfnt_off0000761f.bin
56b119e4e84d8d571edf4c778cbf88cc28b8a3fffcb81f6ef9f0d78d6d0de2d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761F 10204 bytes

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