Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf4e8c03613f68e…

MALICIOUS

PDF

74.2 KB Created: 2020-11-26 05:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be412c3d5465af81dd9bf04e83bc5ebc SHA-1: 9342123649c99c4c22006dd7afef2aefa9356d8e SHA-256: 5bf4e8c03613f68eaaabce5b8d70a106009b823f60497f3020c31de66d8f550a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external resources, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier also strongly indicates maliciousness.

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://gettraff.ru/strik?utm_term=black+friday+2015+gaming+laptop+deals+2020
    • https://cdn-cms.f-static.net/uploads/4447669/normal_5fa22d67c20a5.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f8b450643366.pdf
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5fb2b941ca630.pdf
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5fa166d0e15a3.pdf
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f8dbcb6e8210.pdf
    • https://cdn-cms.f-static.net/uploads/4393189/normal_5faef03f58a92.pdf
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5f985bd4c6d53.pdf
    • https://nukoxifade.weebly.com/uploads/1/3/4/3/134332817/3459713.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f91965271a66.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f874fff0ce90.pdf
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fbb990ec76f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59d4cc1b-4be7-431c-beeb-40d0a296a765/fividufuputipixam.pdf
    • https://s3.amazonaws.com/jeromopelurab/47387803462.pdf
    • https://uploads.strikinglycdn.com/files/ec33a76f-268b-43c9-bd7f-ceaceff6782b/art_of_storytelling.pdf
    • https://s3.amazonaws.com/sefabe/user_adoption_platform_infor.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_off0000e125.bin
f8b8d21c52736b8c13c35062a62e5f7080c412006ba29312efb66491afc50ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 6140 bytes
font_01_sfnt_off0000f612.bin
8b4f2bacae989561183d33a2f03bf2be36fcd7f1e71701dc9177e1b2e352fd2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 11036 bytes

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