Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae116f09d185564…

MALICIOUS

PDF

74.5 KB Created: 2020-12-21 20:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0543a7dd004dfae78f152fee925cc4fc SHA-1: 5d2a027f4b6bfbaa0d12c8ba6db603002c7f6459 SHA-256: 5ae116f09d1855642c8b91c5871c897de8dad872407fff67777ea1fd7dd2fb9a
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://traffine.ru/strik?utm_term=hover-+1+all+star+price'. The document body, though heavily obfuscated, contains text related to 'Hover- 1 all star price', suggesting a lure. The presence of numerous external PDF links, including one to 'uploads.strikinglycdn.com', indicates a link farm, likely used to distribute further malicious content or to obscure the true destination. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/strik?utm_term=hover-+1+all+star+price In PDF document text
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/2442136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20b93c7-5e1e-43f2-83d0-c10c085409ff/42734311493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4240bca0-abd6-457b-a7c6-53f14582e1ad/gomari.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/10637046095.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/vokogerexikewofe.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/financial_english_accounting_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/pirate_king_online_sharpshooter_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/6975127663.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/25570311918.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/paddleton_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e11d8d0-94f3-44fa-8c7e-d62e1113ef7f/persona_5_the_animation_season_1_episode_15.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 16680 bytes
SHA-256: 78ade69b1cd61053c49dd6ddbb6f2ada784a75b73fe57951b567561a22772c6f
font_01_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 5032 bytes
SHA-256: 5b1ec7d8f15b26c9ef5d1d5fb55a313fb13d1caf0e1605db17675b43f6c1bd32
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10624 bytes
SHA-256: acb49be4214b0fc1963377e8b49b244b8631f70123215798426bfdaeee7abb8d

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