Malicious PDF — malware analysis report

Static analysis result for SHA-256 830a62a3c8210213…

MALICIOUS

PDF

76.9 KB Created: 2020-11-18 08:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ce24dc91cf7f6d748c07b9e7e2132c SHA-1: 749388330afc1a9fa01d3aba87f6c03615c2f29f SHA-256: 830a62a3c8210213b2f63b2fb02e84685acc0e465c853f01538c5e49b0eeb46a
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a video game guide. The presence of multiple external PDF links indicates a link farm, likely intended to distribute malicious content or engage in SEO manipulation. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=black+ops+4+zombies+voyage+of+despair+guide
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5fa809caa3397.pdf
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fa00ddfdec61.pdf
    • https://mekesenewinev.weebly.com/uploads/1/3/4/2/134234563/1daaa8c5.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.pdf
    • https://mivegogoke.weebly.com/uploads/1/3/4/3/134365655/gojot-lapix.pdf
    • https://cdn-cms.f-static.net/uploads/4462697/normal_5fa18c3b19a26.pdf
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/02e05.pdf
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/c317fd.pdf
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f9baf28b0c47.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5faedaf02fbca.pdf
    • https://tavafawenu.weebly.com/uploads/1/3/4/3/134395038/wuzilumepulasevi.pdf
    • https://lisubavami.weebly.com/uploads/1/3/4/3/134331762/firisuwajevux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin
8a1495f95cfba78c63143ae48164311ccb4db95071d1c7cbce6657623e1ed872
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 6028 bytes
font_01_sfnt_off000103b4.bin
433b860987cf0b2d6c81ae75467722a8cf11334ab7cef040cf1722fdb44162cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10260 bytes