Malicious PDF — malware analysis report

Static analysis result for SHA-256 5300ba2670f66fb4…

MALICIOUS

PDF

78.8 KB Created: 2020-12-24 04:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df7f1a92568368000e82bc07e6abd6ab SHA-1: b7eae315c37702d8c347ae2b4b70106e6e83090f SHA-256: 5300ba2670f66fb46f50bbe62a8731720ae828c54e67ba3a109e3afb9939dae0
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a redirector link and a link farm. It contains numerous embedded URLs, with the primary malicious redirector being https://gettraff.ru/strik. The document body is heavily obfuscated, but the presence of many external links suggests an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

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=still+of+the+night+movie+soundtrack
    • https://cdn-cms.f-static.net/uploads/4403560/normal_5f9769fde91cc.pdf
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fb26856d30b3.pdf
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5f8ff66589046.pdf
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5fb4dfdfae8b4.pdf
    • https://cdn.sqhk.co/sakiforivona/Zbjd35X/63289341274.pdf
    • https://bufetijakuvarit.weebly.com/uploads/1/3/4/8/134878832/0e15fa256f9047.pdf
    • https://cdn.sqhk.co/neguvobipa/B1jiNhj/76127113625.pdf
    • https://cdn-cms.f-static.net/uploads/4490534/normal_5fb5bd1c0e2d6.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/e39816aaa.pdf
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fa02e19d37f3.pdf
    • https://cdn.sqhk.co/kuruwoke/ha7PwRG/the_managers_path_epub.pdf
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5fc8fbaabd188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tibanepoxilibud/free_robux_codes_no_verification_for_pc.pdf
    • https://s3.amazonaws.com/vutame/completing_the_square_with_coefficients_worksheet.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_off0000f4e0.bin
c047ce98f632362d450708a0a2356dfc7b6d1269975c682b6d6c58befa6e9c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5664 bytes
font_01_sfnt_off000107fe.bin
e2898e086709aa3b7427e1ff50e84bc3ca5535a1663006d806a1549fc424d7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11692 bytes

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