Malicious PDF — malware analysis report

Static analysis result for SHA-256 4649d6405ca5843a…

MALICIOUS

PDF

67.4 KB Created: 2020-12-07 22:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e822c3deea00b29f8b2bb522c4f1a77 SHA-1: dd466861553d7c7c31ff444cfdbfe042c239aa70 SHA-256: 4649d6405ca5843a0024729a510ee95fb366da0e279165185137301b22c58fea
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure ('ggtraff.ru'). The document's structure and embedded links suggest it is designed to trick users into visiting these malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the presence of malicious links is sufficient evidence for the observed attack pattern.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=spaguts+controller+manual
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/gosaxoxigesomugi.pdf
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/tuvivugefowak.pdf
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/wudibomisidoro_serogegak.pdf
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/380c40.pdf
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/65a36.pdf
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/levifad.pdf
    • https://giwirakixa.weebly.com/uploads/1/3/3/9/133999144/zikanilux.pdf
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/pixefozatew_vitudenav_rejix_biratoxuji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/139a1414-ddf9-46e7-adb5-4cefbd5aca7c/weather_deerfield_il_accuweather.pdf
    • https://uploads.strikinglycdn.com/files/e60b9be3-7fb9-4e81-a10d-6c1465cb436a/22628076405.pdf
    • https://uploads.strikinglycdn.com/files/fad3ece4-083a-4bfc-a720-27e81727c635/68738846840.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_off0000c7e7.bin
0d9a61b8bbc9117f58af97795194ad60b52141f8d8be1bf35d7f41f329eb999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 5356 bytes
font_01_sfnt_off0000da0e.bin
cadf1fe8bbb328ac859d6e360f1deb25f1c8aed0471c0bb621e4eb97ee1720aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 11032 bytes

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