Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73194632da26f7a…

MALICIOUS

PDF

36.3 KB Created: 2020-10-11 21:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5600c435a709dc8b1b3a77993b58e43 SHA-1: bb543c040564ad8ac0ff152422842604b9111bb5 SHA-256: c73194632da26f7afee4a7d07ce4c1a7ec372ac85a1df586af40640ce938c6bc
184 Risk Score

Malware Insights

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

This PDF document acts as a link farm, directing users to numerous potentially malicious websites, including one with adult content keywords. The heuristic firings indicate it's a redirector and a link farm hosted on disposable infrastructure. While no scripts were explicitly extracted, the embedded URLs are the primary mechanism for the attack, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=free+amature+teen+porn In PDF document text
    • http://mojabuz.landscapegardenerscamberley.co.uk/uploads/1/3/1/4/131483245/lebajojom.pdfIn PDF document text
    • http://files.klintericson.com/uploads/1/3/2/7/132712154/fejugosoruzeki_kisaxafo_fubanewesusede_guxulo.pdfIn PDF document text
    • http://koduve.whatsthegfc.com/uploads/1/3/0/8/130814017/6293114.pdfIn PDF document text
    • http://files.windrosedestinations.com/uploads/1/3/1/6/131636728/144320d675ab.pdfIn PDF document text
    • http://files.smallcoffee.ca/uploads/1/3/1/3/131383434/bimenagidefa_jotoziw_pigojajisapas_sunidexogubut.pdfIn PDF document text
    • http://jewileg.scratchsanantonio.com/uploads/1/3/0/9/130969685/xezurosapupod.pdfIn PDF document text
    • http://files.beavertonsecuritymi.com/uploads/1/3/2/8/132814768/kilekotu.pdfIn PDF document text
    • http://dekarav.lantermanwoodworks.com/uploads/1/3/1/8/131871590/jarutopekezevavuv.pdfIn PDF document text
    • http://files.offroadandoutdoor.com/uploads/1/3/2/6/132696145/8807218.pdfIn PDF document text
    • http://sijotexun.graceforthebroken.org/uploads/1/3/2/6/132695780/vexemawepogu.pdfIn PDF document text
    • http://files.amypoe.com/uploads/1/3/0/8/130874015/5069387.pdfIn PDF document text
    • http://meriwa.kenjorgensendesigns.com/uploads/1/3/0/9/130969600/8669879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000511c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x511C 4712 bytes
SHA-256: 668245bb8f0c0d09d2cf0228ed2357c90ea1798a61c7e23fc1b4808e2571c021
font_01_sfnt_off00006104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6104 10428 bytes
SHA-256: e3f842afd64a4b75922d0f0c99efd8dd4e2b4b85c94624abbbd1f7cbb6cadcf2

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