Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79eb87cba49a532…

MALICIOUS

PDF

73.4 KB Created: 2020-11-11 22:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b89293098e3da3e90336ca83010ebbe4 SHA-1: be607c7d467ba461a4df40bf390fc1142f53145f SHA-256: a79eb87cba49a532a6d56da12f1535a307694eb81d9ca1806c2da08408086b18
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 pointing to 'cctraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links indicates an attempt to redirect the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/strik?utm_term=my+math+labs+plus+depaul In PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/191e4404625c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f936f0fcc070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f98231a8e058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zirojopemup/cfo_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885b6e8f-18c0-489a-8ec8-c85068665d56/sileker.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/voxebexopazorafezenuzawop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7ed59d-4b49-4c7a-bea8-adda02e1f741/amadeus_movie_notes_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/what_is_the_legal_age_of_consent_in_oregon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6230db4b-6f3b-40ef-a518-082423097569/tetemutaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeaad09-2381-4504-afed-d581306398b2/58066594567.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/dml_breeding_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0ac548-945d-42ed-bba4-8766e3d0e692/vikirixetamisobuvuvak.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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 4968 bytes
SHA-256: da62092913ffd6fa9ae648158f2de578a1cb2b9af9ae2b8ea6697e60bd27b067
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 11100 bytes
SHA-256: c9e7e9d802bb6ae1adaa694823f4dd2257774120f24d7df7d814b7a78500948e
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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