Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f1a5adcff684d9…

MALICIOUS

PDF

83.5 KB Created: 2020-11-14 04:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04935d3c3d0d7a14de197ee91c8a7b8e SHA-1: 95f945fb4d9c93132305fa825f4c3d14a17a8a07 SHA-256: f3f1a5adcff684d935cfbc7c2349f1700ee0b016774aa11984f23d9156fef9b7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or malware distribution lure. It contains a large number of embedded URLs, many pointing to disposable hosting or redirector infrastructure, designed to obscure the ultimate destination. The primary malicious URL identified is https://traffmen.ru/strik?utm_term=free+FPS+RPG+games+pc, which likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffmen.ru/strik?utm_term=free+FPS+RPG+games+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_5faf29e018a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fa8b560b5fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f874b9b271e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5fabae2c5ccf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f9656d060a5b.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/gezumuwavizegekis.pdfIn PDF document text
    • https://dajexave.weebly.com/uploads/1/3/4/3/134352807/603a276b5f.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/5041229.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/2452924.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/tesetaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizup/gsm_technical_specification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8658029-85a6-4b73-974b-782abba5f9b7/87914098087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d6cb04-c4f9-42aa-97ae-4bb27f81735b/nurutibokifobomax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 5696 bytes
SHA-256: aea593bbd3855c6b99edc01cf891307d91fd8990d9b33b3cb4494fb4c830f84c
font_01_sfnt_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 10648 bytes
SHA-256: ce352b87e209e28c9d01fab8c1c92c0e25e71baa897ee12017a83b32b551923c

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