Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dbbaa26337dc59…

MALICIOUS

PDF

48.1 KB Created: 2020-10-27 17:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d39404979012a8fa5cabe5a6eaf627c9 SHA-1: 5ba131fcfa8b3ac9a829b72842e46af27922421f SHA-256: 75dbbaa26337dc59aaa22fa58098ff2ccca6a4d119e2e4d862d1d35340ebe60e
154 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, 'https://gettraff.ru/123?keyword=nipple+suckers+on+for+10+hours', which is a strong indicator of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' also indicates the PDF is part of a link farm, suggesting it's used for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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 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.
  • 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=nipple+suckers+on+for+10+hours
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5f8ddde99ad18.pdf
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f95baac4e930.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8d963149e6b.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8965c26fc30.pdf
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f951dac27ad6.pdf
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5f8d4aad0de60.pdf
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8aa11de92d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/woberiz/wifidajiturukurovigiv.pdf
    • https://cdn.shopify.com/s/files/1/0504/4980/9562/files/silver_beaver_award_value.pdf
    • https://cdn.shopify.com/s/files/1/0486/0546/2696/files/wunipewaxonivizuzele.pdf
    • https://cdn.shopify.com/s/files/1/0498/0257/6036/files/madubosunobavolupubukes.pdf
    • https://cdn.shopify.com/s/files/1/0500/4460/0491/files/tezekebisugulajexorakug.pdf
    • https://s3.amazonaws.com/fumiposamisur/76312411203.pdf
    • https://s3.amazonaws.com/figugipopar/convert_file_to_iphone.pdf
    • https://uploads.strikinglycdn.com/files/b3678147-ebc8-4953-a6d5-3136de73751e/zeraroxofusejunegitit.pdf
    • https://uploads.strikinglycdn.com/files/92e0a66d-351f-49ac-a893-e8587ac0a843/77991414745.pdf
    • https://uploads.strikinglycdn.com/files/b183c8a0-1e27-4648-b48b-d1df34c0f8ac/xevitawobodes.pdf
    • https://uploads.strikinglycdn.com/files/3194ed49-2db2-476c-8563-1f755f4db75c/20784656513.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f65.bin
82ea1a325efbc5f28f2a868bc84c1dbe2d68385a78e237c47a699105c8429789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F65 4924 bytes
font_01_sfnt_off0000801c.bin
745f78c1ca6e90d7ca5e54edaad29202dd3885f751fa975ef39e7b3533682cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801C 10200 bytes
font_02_sfnt_off0000a2ed.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2ED 4324 bytes

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