Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbdf0064c3080ed…

MALICIOUS

PDF

42.4 KB Created: 2020-11-02 02:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bce1e9e2f2a38ebff949cbb6ef6fe4f5 SHA-1: d0b65a35c9783e5e94ce880996e5de36d7072764 SHA-256: 2cbdf0064c3080ed0e1d2b37e8ab8cd0a3fa4c947e79183b199622bd8b6adb50
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.cc/123?keyword=dolby+audio+app+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f91c97a3ff07.pdfIn PDF document text
    • https://buziratefe.weebly.com/uploads/1/3/4/3/134354065/petinuzasep_govomaxe_pagofexu_kosolemijovudo.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/bogigutamonuga-fewezegede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5f93347fb67da.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/5775682.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/797c97c0e.pdfIn PDF document text
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/6601745.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/7640285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/99780764453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7a6370-e3bb-49a4-9b64-a10bb4d9760b/muzut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbf37bf-f9bb-4f62-b1b1-0576a72bfa96/sizilidijudosexizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3485/1503/files/asus_b85m-e_csm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7622/6724/files/stack_on_22_gun_safe_big_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0889/9262/files/msi_b450_tomahawk_motherboard_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efe0814-b126-4910-b681-675919ba7437/nagirekuxotuvowuvin.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_off0000670b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670B 5016 bytes
SHA-256: 39cb754cc2476b8141e11ce7fed21dfc5f86cdd271b0a48eb30383dfbace6eac
font_01_sfnt_off0000782b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 10684 bytes
SHA-256: 27d523c7f713a0907f201d2e004b94ade6f3e4dd4f01fe262eee59ff3d115e31

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