Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4029db3bc4cc71f…

MALICIOUS

PDF

73.8 KB Created: 2020-12-28 15:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 67851248d888f62d94d5b3217223dcc0 SHA-1: ff3344e4c5d400c150194b117f66f3f260fb9fa2 SHA-256: b4029db3bc4cc71f80a0c0ef3269377227e0101bf5540c73f4c7b5b1b1de972f
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/123?utm_term=short+clean+jokes+pdf'. 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, supporting the assessment. No scripts were extracted, but the embedded URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=short+clean+jokes+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fe07171d3a4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488574/normal_5fc6d15d3220b.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/bhjiiia/450223848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444885/normal_5fd62402b1233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fbb36816e445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f992a72c4205.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/a99e7ceb-461c-4ef4-a039-d24780438627/black_misery_langston_hughes.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/xunaguv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fe65d7-f7f8-4985-a542-f98ba19db410/tunojovoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/plante_africaine_aphrodisiaque.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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 5484 bytes
SHA-256: e4788d4d306a4f34e95a26ba3651f7e56b474641c5d2a03445d691dff1579f19
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 11256 bytes
SHA-256: 54302e57a086bc425c83424cd7d4bc2603e065b50262d6389938de9df956bddb