Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b90f3070a8513…

MALICIOUS

PDF

65.9 KB Created: 2021-01-03 15:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ae7bbc78fd80ba5ce8c283ab7cea3ff3 SHA-1: cae104476b947f72963f4e841ac58893931ee272 SHA-256: 8c4b90f3070a8513659566e18e1b3440f7fb30a9f60bbf3c80b3202002c1abdb
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant portion pointing to a suspicious domain ('traffking.ru') identified as a malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful content. While no scripts were directly extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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://traffking.ru/123?utm_term=matar+a+un+ruisenor.pdf In PDF document text
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/4683752.pdfIn PDF document text
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/5eb24baa3fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fa14d406bc2b.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/fewesenag_fujuleroxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455876/normal_5fe1a5dd22391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fe9a97a3c9dc.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/wanasuvedigo/tratado_de_direito_penal_3_cezar_roberto_bitencourt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21bce89-3943-4118-a6fd-07ba60ba0a46/rebibelulugutifafonetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf8fdce-3399-4610-8000-9c936889de4a/mugen_stages_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59476873-9b88-44cc-b2a5-2e9c516e6552/god_of_war_ps2_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777f7de1-eaa1-4aa1-9f8a-53c95f608f8e/in_the_march_of_the_flag_albert_beveridge_supported_which_of_the_following.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35b193b-395b-477f-8fc5-d84e33746a0d/30183314099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9e6a18-88be-41b8-90f1-737ac2e6b945/soccer_heads_football.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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 5040 bytes
SHA-256: caa712c3f0579ed7963d6e2982dd998c8137ad175188d57b18b5dc44839183c4
font_01_sfnt_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 10344 bytes
SHA-256: 51ff4c9129e5487276049f858e0f6055176c97bf8cfbac46b06fc0bc7e13c5b4

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