Malicious PDF — malware analysis report

Static analysis result for SHA-256 8823436bae535eea…

MALICIOUS

PDF

76.6 KB Created: 2020-11-23 09:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c5bb0633f6c97f970faae3662ef70ec0 SHA-1: c001f274fe5a2b6f1b8e6b5e408feed6a76fc6ca SHA-256: 8823436bae535eea346728d5fdd31bc39d1208b1b464254c42e1ddf7640c481a
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, identified as a link farm, with a critical heuristic firing for malicious redirector infrastructure. The primary malicious URL observed is https://cctraff.ru/123?utm_term=big+paintball+aimbot+and+esp. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or malicious redirection attempt.

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://cctraff.ru/123?utm_term=big+paintball+aimbot+and+esp In PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/002d092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f8b7eb4d6f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5f95d009348d4.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/ceb936ec-80b3-4ecb-8c8c-bcdfe93ef1fd/weropujatopafozidituwox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa963da-ba68-4fbf-8d1e-a0dc7a863569/27761831761.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/arithmetic_sequence_worksheet_algebra_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e22990-df8c-4b74-a5cf-46eac3d1f34f/reprogram_bmw_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49aaf01f-e794-439e-8137-0db948b6b837/60406566766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72369c4-8200-4be6-b4b1-83345eb6b417/sajebudojinisawupapazam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ebab1d-7a24-4ef1-b932-fb34892d4046/33284556818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74a2ed6-ef1f-4cc9-b3c8-dcaa866f2c60/pilumimizuwinozeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a62b4e-da80-49ef-82ea-fb4141ccd88d/3061765860.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/ripapefowejunatuz.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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 5372 bytes
SHA-256: d5c8435737805ec9f5e5cfda4984adeb4cfc1a653e3ac7870f9d357b63ba304b
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 11696 bytes
SHA-256: 54a4a9ee0b4c9b54eb0161e0700d43f32713c085f31e81f356f5121fc3f6c2b2

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