Malicious PDF — malware analysis report

Static analysis result for SHA-256 678a2c6ed41289f3…

MALICIOUS

PDF

69.8 KB Created: 2020-11-24 09:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f0c498a3424cbafd925331b208d12fd SHA-1: d228a067efc03d08427096b7797cc193bf840d6f SHA-256: 678a2c6ed41289f3c7b82a5f2277217ce6f40dec1fe7ab8e31538d4d78cdeee5
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/strik?utm_term=will+the+circle+be+unbroken+bioshock+chords'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a potentially harmful site. The ML classifier and ClamAV also flagged this PDF as malicious, reinforcing the assessment.

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://traffmen.ru/strik?utm_term=will+the+circle+be+unbroken+bioshock+chords In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5f958267439eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f90434ecb7ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f9c0d5504a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8d8e8f5c047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413108/normal_5fb789dd33a05.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/tetofamuxulil/92905408102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5aa65a-99e0-4532-bdc5-43b8740d4bfa/viliguwuxojuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ff51fb-80df-46c4-8dfc-b630fe27521b/75609635667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b84d85-25d3-4c69-8611-3fd58fcd8908/concha_y_toro_marques_de_casa_concha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fcddade-ac19-48cb-8985-b71c96afdbb8/jeforilijig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1560703-cfc8-4aff-b0fa-f21c1c9dbcfb/lolanoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44060428-2a99-48b7-9458-e24332cb9877/don_t_starve_charlie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94df49f4-4ce3-45e6-bee2-c500caf9a090/65802272411.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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 5036 bytes
SHA-256: a0a35c809e9f9a9bab48a3e639c41cb99229dde74ac90c31e3ff47dd01140105
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 13596 bytes
SHA-256: 61c003868f4969c45837624d2b49d971341e1f139b1ebd4c56848f39a0c9c76d

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