Malicious PDF — malware analysis report

Static analysis result for SHA-256 85160b0b9a542ddf…

MALICIOUS

PDF

39.1 KB Created: 2020-11-08 04:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3790b4f5e4d93ab9f274e63a83789658 SHA-1: ba49a51a2dea44a7a61dbfed7d262fa5ccdc6ea4 SHA-256: 85160b0b9a542ddfcd05cc8812a2cea9e8d3222473a0e084e42c510dbb772e0b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/123?keyword=barnyard+soundtrack+lyrics'. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to harmful sites or to generate traffic for SEO purposes.

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://ggtraff.ru/123?keyword=barnyard+soundtrack+lyrics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414867/normal_5fa01ce2f1fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f9d65eacd039.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/26c2ad0d-3a96-4a40-85dc-765de9e23643/garden_tiger_moth_caterpillar_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88caab62-db35-4b7d-9a7f-e35c920ea042/zeguru.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09dd058d-50bd-4727-b1be-c1406a8a18f8/80099775962.pdfIn PDF document text
    • https://xoditova.files.wordpress.com/2020/11/kamiwumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91972514-08dd-4650-acd4-b5d911f92e1a/icd_10_cdigo_para_hiperplasia_prost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d193e5-f5d7-4570-9195-184794b4dbf8/21272027412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf178e7-adf9-4a00-9aa4-077c9e9b81a3/35916134047.pdfIn PDF document text
    • https://zipexazoti.files.wordpress.com/2020/11/vekomozewegebanerilim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41288c60-8401-492b-aab9-60dcbf1cc1ef/waviziwopajor.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_off000059b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B3 5148 bytes
SHA-256: 1107c6946a39c8fd86eb0b046fdfc8a4b9b2b6ea644ceed8586c4b34055a5466
font_01_sfnt_off00006b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B54 10872 bytes
SHA-256: 8fdf3699a915e43040005317df2e7f707eb46165a79e15c74aec09bf23cbeb25

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