Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cb6424ad39af63…

MALICIOUS

PDF

67.0 KB Created: 2020-12-19 11:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f0696bc787904096813a77085b89b427 SHA-1: c2d73c17a6c52e225982e33912c7a58174b94ce3 SHA-256: a2cb6424ad39af63a266bab4dbf217237ca65033742394310958133e27902df4
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The primary malicious URL identified is https://traffmen.ru/strik?utm_term=t%25E1%25BA%25BFt+2020+m%25E1%25BA%25B7c+m%25C3%25A0u+g%25C3%25AC. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9670

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=t%25E1%25BA%25BFt+2020+m%25E1%25BA%25B7c+m%25C3%25A0u+g%25C3%25AC In PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/a5e6480c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fd77f41f1e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd38d49ea538.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc28eaf9698b02c7f2b2aca/t/5fc5df163485235c8691e8e6/1606803224970/waltham_youth_baseball.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe03ca08845d092450f098/1606288331677/universal_android_root_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a94bca-7c10-4623-a750-13400a044640/epic_emr_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35224ee4-8ddc-4737-95d4-6ad490341a07/79287957926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875a686f-65f6-4351-b2e6-855ad5eaffeb/36218132163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0c7054-eacd-4aaf-abc4-d03adc5d590c/23232284808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22856ee-4f94-4423-9687-6357dd625777/98046821886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef784ba7-5f62-451f-80b1-f945b39e25cf/lewis_diagram_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3105d9-6880-40c0-885e-9fa98756a8c8/27607388074.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD08 5564 bytes
SHA-256: a8a3aeef835ceb6e9d70ee1129080b17b7ed69567b575c751a9fd2cf341cacc2
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 21008 bytes
SHA-256: 94221c34992aad1e2a396a6d40ba74589c73112af0e2a3d1cd2d721bf8bc54a7

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