Malicious PDF — malware analysis report

Static analysis result for SHA-256 337f9771f0cde0f8…

MALICIOUS

PDF

73.6 KB Created: 2020-12-25 14:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6484bf8ffc88ceca28d521c93fc50426 SHA-1: 78e385da7b1d807500441b4012bcd056fd244fd5 SHA-256: 337f9771f0cde0f869c44cadf6fc0704ebaf908e1dedabd63283ee5ba0d23685
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://gettraff.ru/strik?utm_term=space+run+game+cool+math'. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious URLs and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=space+run+game+cool+math In PDF document text
    • https://cdn.sqhk.co/marixefe/1vdChaV/sebigosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_5fd8dd069ac3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5fa7a529c7abb.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/d5Mbjef/27586746645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8899aece358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fbf4e911d860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_5f97718cef8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fd2cbbdd1609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd2efe2306e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/2567985642.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/6730933733.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/legend_animated_text_video_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/81852316587.pdfIn PDF document text
    • https://s3.amazonaws.com/dirijazi/vocabulary_workshop_level_c_answers_unit_4.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/icecream_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/bevaxod.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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5272 bytes
SHA-256: a05f41bfa593f6eaef5a43ee738bc8175db0dec4acc835ead32b63e5bebb710d
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 10900 bytes
SHA-256: efed379a1b7b60d1333f443c55c8b7d6a1c7a25245eae16dc004880c2c060402

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