Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac381d9b50e47dac…

MALICIOUS

PDF

52.8 KB Created: 2020-10-30 23:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8ce13125abaa9a319f83c4f0cc45e48b SHA-1: d91226144bb2509570d5bc30b7d2a7eb53166b48 SHA-256: ac381d9b50e47dac01262f26be2185833b15c8c86297057894a856a86fb310d3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=n7+surface+finish+equivalent In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/baresedivotipu_gupajopijalimi_nezebakowij_rajalixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f8a486ec9395.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/543e0c2.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/5864648e0baa.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/2792466.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/9d9e6dc0-080d-4807-98ee-b6510d070cea/cheat_codes_for_witcher_3_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83016c0-1dc0-4a84-a131-b3960f227dd7/52256186050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/jimifon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5272/7972/files/distributive_property_multiplication_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4704/5278/files/town_of_north_andover_ma_tax_collector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ec4729-a743-409c-9073-f0b37c233e01/66380053511.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_off00008b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B32 5204 bytes
SHA-256: 255026ce7fd85174f9ffd378e64d63f422c8a5c29883d577ea2d865deac916c9
font_01_sfnt_off00009cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF6 12808 bytes
SHA-256: ad34a8ad23a988998133f53785271b4213b94036ca88ccd293e1a893dfac8afd

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