Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabbbd338d776919…

MALICIOUS

PDF

58.0 KB Created: 2020-11-05 01:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bcc0d184ef5f2cd08e16ec99a77d5a08 SHA-1: 286f008af62b6fb247d5948cdd206a641efe38a3 SHA-256: fabbbd338d7769193a1f4f7a398f06305b06b2082f4a0dd54d53d1d3d5fea562
124 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, specifically `https://cctraff.ru/strik?keyword=husqvarna+manual+18542`. This is further supported by heuristics indicating the PDF is part of a link farm on disposable hosting, aiming to improve search engine rankings for malicious URLs. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=husqvarna+manual+18542 In PDF document text
    • https://dotifusogibosu.weebly.com/uploads/1/3/4/4/134458831/retapezunokosedakaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5f9d5e78accea.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/dudilelimija_zexumen_rovogosojeka_bikoregowamewol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f9347cf20570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f9f20a07933d.pdfIn PDF document text
    • https://kukajuma.weebly.com/uploads/1/3/4/3/134380089/misivemixaradewukol.pdfIn PDF document text
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/235a50.pdfIn PDF document text
    • https://mogazikazalag.weebly.com/uploads/1/3/4/4/134440800/xojapimogetotipugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_5f997be052945.pdfIn PDF document text
    • https://janunawavi.weebly.com/uploads/1/3/4/3/134314220/sexoxavew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f8c703559040.pdfIn PDF document text
    • https://xudaxeja.weebly.com/uploads/1/3/4/3/134339900/694eb23791d79.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/190545f5-411f-4ea9-a909-86b006574b9e/53443997210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bdf40e-c3ea-4d56-84f5-6cef5f3dfecf/95816841074.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4F 5568 bytes
SHA-256: 4934cc237c75e5806ffe4bc5d5b6dddf8920d3830aa0bc21dbada736a338ffdf
font_01_sfnt_off00009e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3C 12548 bytes
SHA-256: b22053fe2fbbb7f3ac806e387965dafb717cd217d9e433f67702294f07084b32
font_02_sfnt_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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