Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8458d4f656ea267…

MALICIOUS

PDF

39.4 KB Created: 2020-11-05 16:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11f7c714fb9efc73624074e47d62c665 SHA-1: 1de35364ed1d91259bba5532e9dee6001d7971e5 SHA-256: f8458d4f656ea267bf0ed8a4dab736784b06994523f69c574f3bb5ef2472ad10
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 PDFs, which is indicative of a link farm designed to manipulate search engine rankings. One of these links, https://traffmen.ru/strik?keyword=aquarium+worksheets+for+kindergarten, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a coordinated effort to drive traffic to malicious infrastructure under the guise of educational content.

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://traffmen.ru/strik?keyword=aquarium+worksheets+for+kindergarten In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f913686565fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5f91a3863c1cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f9fd6af5398f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5f905e38857bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5f986e5f74480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f87330b4c636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5f9984e76df75.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/69900c444b8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5f9a6d3cd4411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5f9c801c8b3ae.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/c185e13d-0fd3-40b1-a189-e17f10fabab1/25716146842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491eb719-4480-4bf7-9d78-878e285a8d88/how_to_run_c_program_in_terminal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0fa911-1c04-48ab-bfea-ebdcec2a5b6a/6174616834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d99718-a73a-43b1-97fc-c9435238e98b/dragon_age_inquisition_hinterlands_landmarks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c35d62-162a-4faa-bae7-95f6311f44fe/xisudesuvijutenobepibune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3a8ce6-cde7-4f05-be28-025368722316/pixexefunowekavo.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_off0000593d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x593D 5560 bytes
SHA-256: 418c9735473a105a7dd14cc31813c5a8a6abd54556e8043a8c8972d0e6ab9cfb
font_01_sfnt_off00006c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0E 11140 bytes
SHA-256: a83d6f33eb312b69a648b1536433d1f29cb4b9e52ebd58cb8c493d9b6ad44aec

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