Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fb4fbc40405f53…

MALICIOUS

PDF

57.8 KB Created: 2020-11-14 04:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 13a46967ede2e09f5ae56ae3c7b4592e SHA-1: 5da81f01cf19a839cd08771886568e759a9b8489 SHA-256: 50fb4fbc40405f53f0873aae28d7df430993999a5337351957fb4bcbf170ccbf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=high+school+geometry+construction+worksheets'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=high+school+geometry+construction+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5fa1ec3a2a57e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f892b014083a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5f96fc54ee065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f8e4f8cc836d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5f91ce24006d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5f9c0a36b2f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f9afa110d6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f88cb968bbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f9aca6f72a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8737e3cafe0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c000aa-0c16-40ed-bc9c-898d2f2a4fc1/ses_kayt_ve_mzik_teknolojileri.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/mans_search_for_himself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf912a4-2fe8-4875-a4d2-a7a9d1fa8ee6/why_was_the_crop_lien_system_bad_for_farmers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000a95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA95A 5224 bytes
SHA-256: a17d61a5bd56759ce8a991b6d9841032514befa0c6c49d81ce21d0ad501b6f6a
font_01_sfnt_off0000bb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 8708 bytes
SHA-256: 1656da8f99c147be639ee9bea71a954adc46eda751fd96d6669deba4923c7596

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