Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c87e4d33a876d6d…

MALICIOUS

PDF

50.6 KB Created: 2020-11-11 17:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31d88e6c4e856c7e6576d088a6254c4 SHA-1: aabb42ceba2a7a8d6c1f11e294173d5c0e8f45ba SHA-256: 7c87e4d33a876d6d75780871e006bd04e38e3972d6add1f32e4616b40a4a9829
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. A critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/aws. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it may have been generated by a tool rather than a standard document editor. The presence of embedded URLs and the overall malicious verdict strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8283

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=royal+12+sheet+cross+cut+shredder+reviews
    • https://cdn-cms.f-static.net/uploads/4456676/normal_5fab60719a5f7.pdf
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f909776a5a8f.pdf
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f9c71c5b77a6.pdf
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f8fc69a7272f.pdf
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f98a78e451a2.pdf
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5f9946cfbf6c1.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f89b5e8d7f77.pdf
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5f9dd2af917ec.pdf
    • https://cdn-cms.f-static.net/uploads/4412895/normal_5faa28af0c4b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rupatojuko/keystone_wheels_refinishing.pdf
    • https://uploads.strikinglycdn.com/files/827e521e-16c8-43aa-a45b-52d0ad020983/29978553317.pdf
    • https://s3.amazonaws.com/jemazejodep/puzzle_questions_and_answers_images.pdf
    • https://s3.amazonaws.com/zasepo/venezekijigareruzonudije.pdf
    • https://s3.amazonaws.com/sugaguxagu/21282624328.pdf
    • https://s3.amazonaws.com/mupukesunobaga/prima_bucolica_testo.pdf
    • https://uploads.strikinglycdn.com/files/c8e1ed95-6fc0-4401-9c4d-d3d8968533a6/56647855584.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af34.bin
66564e2d8b0b7e9bad405681ef26198ae7896192d43a88abcf07e3a9cb5efcdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 5472 bytes

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