Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbc88a916ec4586…

MALICIOUS

PDF

45.6 KB Created: 2020-10-04 09:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 270282676fc3355a5aeae696ce98db78 SHA-1: ded11c005ea835d13d29970e565851956c6f071e SHA-256: 0dbc88a916ec458655d859496c7f8e21d77e00a449b47c7ea5d0d86051d95f08
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=2006+toyota+highlander+hybrid+owners+manual+pdf`. The document body, though heavily obfuscated, contains text related to a vehicle manual and the URL itself, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure and link farm heuristics strongly indicate a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://cctraff.ru/strik?keyword=2006+toyota+highlander+hybrid+owners+manual+pdf In PDF document text
    • http://files.violinstringreview.com/uploads/1/3/1/3/131398091/93bfd50a438.pdfIn PDF document text
    • http://jomos.joyfuljourneystravel.com/uploads/1/3/1/4/131410227/fubazovetejego.pdfIn PDF document text
    • http://files.internationalgrandmasterscouncil.com/uploads/1/3/0/7/130739895/35dbca41c.pdfIn PDF document text
    • http://files.wilcoreph.com/uploads/1/3/2/6/132696104/pujozolaroge.pdfIn PDF document text
    • http://files.pickleballthornbury.com/uploads/1/3/1/4/131453124/suvupenozubopiremek.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/23762706471.pdfIn PDF document text
    • https://site-1040135.mozfiles.com/files/1040135/95379677117.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/5f92efd6-1ce8-4614-bf8f-de5a8d65d5a3/xavagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6deffbce-a704-4936-aa61-5a9c9b778561/27470825554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd2027a-dc4f-404b-9aef-218c8301019c/52406358671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f54cb7-7f92-4692-a273-eaafd7748964/92616540052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf70724-3d77-41aa-be3d-7e18bcfd496d/70579254886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99ce7a3-89ff-4419-b78e-d1ed2a165d79/potekes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6decac-2ebb-4150-90e2-2d085582a0fb/22989124729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a047ca-4129-4a0c-a996-bd1e154a60a3/15449464579.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_off00007178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7178 6120 bytes
SHA-256: 916da280a5bf9abc2b12b84220886a38c98f1f9febe975ee6304733b3ffcac83
font_01_sfnt_off0000862d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 10192 bytes
SHA-256: 997f125c39066c9f32f1f5bf28a7f57cf7e239b022f58fbbcfa7c8b1b35bea59

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