Malicious PDF — malware analysis report

Static analysis result for SHA-256 969bd8b321ab93d6…

MALICIOUS

PDF

71.3 KB Created: 2020-11-13 23:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07f9ec3c34569200096214e69823a342 SHA-1: 5a4300e0e77447c3c36b203774c0f68ecd6c15f1 SHA-256: 969bd8b321ab93d6e7ce8bddaccbbd54027aebbc2834d84392d3c97f7f36e00c
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://gettraff.ru/123?utm_term=castle+clash+cheat+codes`. The document body, though heavily obfuscated, contains references to "castle clash cheat codes", suggesting a lure to attract users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=castle+clash+cheat+codes
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fa8c816d67e2.pdf
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f9438e6077f4.pdf
    • https://cdn-cms.f-static.net/uploads/4451018/normal_5faa4676cdbd6.pdf
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/a5751e354.pdf
    • https://cdn-cms.f-static.net/uploads/4404739/normal_5fa3202189232.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/netajexotikawita.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f875f8700806.pdf
    • https://cdn-cms.f-static.net/uploads/4389816/normal_5f9134fc6efd8.pdf
    • https://cdn-cms.f-static.net/uploads/4447467/normal_5fa153c89aa29.pdf
    • https://cdn-cms.f-static.net/uploads/4420031/normal_5f98b1221b007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavejijitatofu/jafosazukoxu.pdf
    • https://s3.amazonaws.com/zirojopemup/note_taking_worksheet_the_nature_of_science.pdf
    • https://s3.amazonaws.com/bitajemisajoz/scheme_of_work.pdf
    • 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_off0000d9bc.bin
289ec7a2be2d5350c5d6331e99e560cb2cf48e14501447e3321be82c3ec7f2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 4836 bytes
font_01_sfnt_off0000ea20.bin
23d0c93587844d7b2b00987fa6dfd291d20b4a63a00a017cdf7cac9c794039fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 11400 bytes

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