Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc6f5796079ee25…

MALICIOUS

PDF

72.2 KB Created: 2020-11-22 09:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bfeb70a53d91eb982e03355ebe0857d1 SHA-1: 538fc821b39095499c3ede3aae904760c7349235 SHA-256: ffc6f5796079ee2587a566d0d099c6aa9f5590494f540f50c53999a3a08d322b
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting it functions as a link farm. The primary URL identified, 'https://ggtraff.ru/123?utm_term=cooks+6-slice+convection+toaster+oven', is likely used to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=cooks+6-slice+convection+toaster+oven In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5f8caf1a4d830.pdfIn PDF document text
    • https://loxazofobel.weebly.com/uploads/1/3/4/2/134265844/ripeposuragidelipan.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/5c418271e485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fab902d1c9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461204/normal_5faaf975e3e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f8a1ba0b897a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5fa434b7a3528.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/5229859.pdfIn PDF document text
    • https://redilabow.weebly.com/uploads/1/3/4/3/134316718/vusojamisifazafix.pdfIn PDF document text
    • https://vamoketuvet.weebly.com/uploads/1/3/3/9/133999376/mevememozarara-nubowenuwoli.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/dibedamoka/17360622826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35e6d34-05e5-473a-9581-f27aabec68ac/nunemeguwidibinaxi.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 5008 bytes
SHA-256: ec8d6fc9136c743a97a47581cc881189fc11295b2cf46c440a6aba70ed3e5bfc
font_01_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10696 bytes
SHA-256: d190dc2e6134425090cda74900e1eeb7e9f5e6f1ff0f005a3a5627e30bd217f4

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