Malicious PDF — malware analysis report

Static analysis result for SHA-256 0224585ca993473a…

MALICIOUS

PDF

65.7 KB Created: 2020-12-26 03:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 346efbb9f6aa84f99b76a7e2156a6220 SHA-1: 1841f8a8c48e8a5b6c77547363ea6da4468b077b SHA-256: 0224585ca993473ab84f705ff9ba3771f40417f3971d8743c88b6b58134952fd
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'https://gettraff.ru/strik?utm_term=zombie+hunter+sniper+apocalypse+shooting+apk'. The document also exhibits characteristics of a PDF SEO link farm, embedding numerous external links, one of which is 'https://uploads.strikinglycdn.com/files/22adca53-a0a7-4987-96e2-c8e8714fbf19/25056935765.pdf'. The presence of these malicious links suggests the document's primary purpose is to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/strik?utm_term=zombie+hunter+sniper+apocalypse+shooting+apk
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fa1b567b79c7.pdf
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/148af.pdf
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/61d2741.pdf
    • https://cdn-cms.f-static.net/uploads/4490529/normal_5fc201533b86a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/22adca53-a0a7-4987-96e2-c8e8714fbf19/25056935765.pdf
    • https://uploads.strikinglycdn.com/files/c92e30b9-bed0-47d3-916a-b0ab0c039d65/rit_fabric_dye_tie_dye.pdf
    • https://uploads.strikinglycdn.com/files/2e144685-2b3e-4f3a-8c6e-244ab0250834/ciclo_biogeoquimico_del_fosforo.pdf
    • https://uploads.strikinglycdn.com/files/731d46e2-9897-4579-a969-8a8e046d68cb/bujidurirokesef.pdf
    • https://uploads.strikinglycdn.com/files/b86a8454-172d-453c-ad30-b60c25950aa8/alum_creek_state_park_campground_rules.pdf
    • https://uploads.strikinglycdn.com/files/85454807-a423-4957-b773-e048fb8e753e/bdo_training_dummies_xbox.pdf
    • https://uploads.strikinglycdn.com/files/1767341a-d085-466c-996a-d87c6f6e944f/iep_direct_manual.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_off0000c223.bin
d95d50dedaad16158d8039851cdbe489fe03cd87864e85f55c3b25141605cfd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 5612 bytes
font_01_sfnt_off0000d516.bin
31f9e536fa81c540c626331705a8e978feb215dc19a0995fe34961300c6279bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 10840 bytes

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