Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ece25fc4ce271bf…

MALICIOUS

PDF

71.3 KB Created: 2020-12-10 03:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a9a7defcbfc75751f0d73496bc59ef SHA-1: 7b1cb5b1e3853fd78d5659ec2e2d5acc2f036f9d SHA-256: 2ece25fc4ce271bf3c8d837678c6d9caf0adb774fe337e481b38e2a23bd258bb
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, including a redirector to 'gettraff.ru', suggesting an attempt to direct users to potentially harmful websites. The presence of a link farm, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, points towards an attack pattern focused on SEO manipulation or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=mid+america+corvette+exhaust
    • https://vofepelatuj.weebly.com/uploads/1/3/4/7/134768647/1266896.pdf
    • https://birobidusizal.weebly.com/uploads/1/3/4/6/134638138/bf8907d.pdf
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/wixapofosapu_vurutik_jufudemo_mukop.pdf
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/3b6f4.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/8944204.pdf
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/zexowiju.pdf
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fbba84d7bf05.pdf
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/nevisopagelosaw_lemefitil_samarizez_fuxuvopof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dowavelaxam/ingles_archivo.pdf
    • https://s3.amazonaws.com/sesijesule/report_on_declamation_competition_in_school.pdf
    • https://s3.amazonaws.com/jidosatikim/zinuporaxixegexajamefewup.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_off0000d9e5.bin
23c442ef067fb16292c375156e7efcf1c013a64d0003b7cdfb70ca768e886009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 5280 bytes
font_01_sfnt_off0000ebc1.bin
34265b9c2ee4aec2658da23e831a3a676164f057b3a9131bc267f1018f4b360b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 10988 bytes

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