Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa7c13469e3999e…

MALICIOUS

PDF

72.4 KB Created: 2020-11-20 04:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d897ba4debf76323b70aa1e684ec199a SHA-1: 86e2ab7e9286f85df9baa2551edeba75078ade4e SHA-256: 9aa7c13469e3999ee23373bc2142353377cdbf411432581918750ffce149cbf9
214 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://traffmen.ru/strik?utm_term=p0420+chevy+malibu`. Another heuristic flags it as a PDF link farm with numerous external links, suggesting a phishing or spamming campaign. No scripts were extracted, but the presence of malicious links strongly indicates an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=p0420+chevy+malibu
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/fuzukowata.pdf
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f906d68625b7.pdf
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5fa9ac92a76cc.pdf
    • https://lowurewuxuvid.weebly.com/uploads/1/3/4/4/134464573/61fef3bc03.pdf
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/pubasilowitojefeja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tugumeb/suzokariwiwapi.pdf
    • https://s3.amazonaws.com/sabegokek/zosufidodofive.pdf
    • https://uploads.strikinglycdn.com/files/a9d70136-e48c-45eb-81fe-b2253b5f0961/starting_out_with_java_early_objects_5th_edition_download.pdf
    • https://s3.amazonaws.com/mogedozara/symmetry_worksheets_for_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/f7c1639f-22ae-4ea6-a60e-429dcd5eaa7a/54206293337.pdf
    • https://s3.amazonaws.com/vesubodufisi/employee_accident_report_form_doc.pdf
    • https://s3.amazonaws.com/fekazudabo/wwe_finlay_height.pdf
    • https://uploads.strikinglycdn.com/files/5cde83c5-b951-4aaa-b636-b865f3cb0410/52015328000.pdf
    • https://uploads.strikinglycdn.com/files/b846563d-4b9e-415e-82c3-36ab51133d08/world_war_z_best_class_setup_co_op.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d172.bin
14033272ed5304e4e2cb1a8265231cfbbbc2ebe4c5eced673560f0e7d8b59086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 5016 bytes
font_01_sfnt_off0000e28b.bin
04196dcf92781287babcd54425ded030df8aecc343b6e0c52d09044a83de96d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 10500 bytes
font_02_sfnt_off0001067c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 4324 bytes

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