Malicious PDF — malware analysis report

Static analysis result for SHA-256 c753ca73cae1ea61…

MALICIOUS

PDF

74.1 KB Created: 2020-12-16 16:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 67933cd15be5621db891e7ddc14bfc71 SHA-1: bd04bc466ce94d3adfab8b5c9afb38f56904961a SHA-256: c753ca73cae1ea61bcc4d9f5feb6ccb0b304b48c87a244f3f018dd0dc5fd3130
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 'traffine.ru'. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated and unreadable, the presence of a malicious URL indicates an attempt to redirect the user to a potentially harmful site, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

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://traffine.ru/123?utm_term=dark+souls+crossbreed+priscilla+lore In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f9287cfa305c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5fd08fa274fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5fa796fe36cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f98d4591802e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf558ee18c5c478ef2e8fe/1606374798773/hamer_slammer_series_serial_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/sizesiver.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/12401521531.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee65f3de5e49b5291617/1606282854478/persona_3_kenji.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/consumer_reports_bottled_water_with_arsenic.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/new_action_game_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe052b3f75b166439be320/1606288690003/tft_monitors_for_sale_in_nairobi.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/51440896109.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a186084698658e7e922b/t/5fc7700b5fecd2174b60001e/1606905868739/vagugijogikapube.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A9 5268 bytes
SHA-256: 47156870b56fd72905105a931ac44b617b2e3b597646900e51f90faaeebb46e7
font_01_sfnt_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 20684 bytes
SHA-256: ea0a9efeed67e39f4cf546de69c88b9b42a095d89108bc310106c5d15179750a
font_02_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10780 bytes
SHA-256: c0908a642025592324638417080c1a3094d602f56f0914cbf3b26db59d7e3d93

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