Malicious PDF — malware analysis report

Static analysis result for SHA-256 2541a4f819c10d96…

MALICIOUS

PDF

115.0 KB Created: 2020-12-31 05:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6785cb354f02fefa3e07ed45b0e960c4 SHA-1: 52876708458e3621f9e945f19d2dd27a5094c237 SHA-256: 2541a4f819c10d96255b223fead73be9c459282e76ff67753f56645d0b9d99b4
222 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, including one pointing to a known malicious redirector at 'traffmen.ru'. The document body, though heavily obfuscated, suggests a lure related to a game, likely to trick users into clicking these malicious links. The presence of a "download button" heuristic further supports the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/strik?utm_term=brick+breaker+jar+240x320
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5fccee1299887.pdf
    • https://static.s123-cdn-static.com/uploads/4493209/normal_5fc93ffc14c91.pdf
    • https://cdn-cms.f-static.net/uploads/4443594/normal_5fa4ec9d15f41.pdf
    • https://cdn.sqhk.co/veleviziwew/5hcn5ij/pokemon_go_dragon_scale_evolution_list.pdf
    • https://cdn.sqhk.co/jenotonolo/ghhiagg/vagejimumiwolodiligifawem.pdf
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fdc4ea477551.pdf
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd16025d051d.pdf
    • https://kigibituridugu.weebly.com/uploads/1/3/4/3/134352406/xurejinomebina.pdf
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/9d2d90bce8c3a.pdf
    • https://cdn.sqhk.co/rusefijow/jijiGjj/russian_car_driver_zil_130_premium.pdf
    • https://cdn.sqhk.co/pimidima/ijetu8H/52715724165.pdf
    • https://cdn-cms.f-static.net/uploads/4464732/normal_5faaf3f8f38e1.pdf
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcb6a182446b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobobowu/mozilla_firefox_nightly_free_64_bit.pdf
    • https://s3.amazonaws.com/vajefam/safalujalo.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_off00017f25.bin
61af56071a34f1f3faed49d62689bffefa98c85f2f50ec147784b66ad2bda27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F25 5504 bytes
font_01_sfnt_off00019206.bin
d318e5d244791bdc33e142de12dbc82c4d154a74d91556ebbe4fa9a31bc7e37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19206 14836 bytes

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