Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c6fe86b95c7319…

MALICIOUS

PDF

46.6 KB Created: 2020-11-05 02:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3359f9b52c6c137b3f99d431f7b9cefa SHA-1: 81d799ae52a338d715c7e714bb9a472c1ab0cb26 SHA-256: 75c6fe86b95c7319a28d22892a16f703c334f02fec878624b6b37030f134ee84
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 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/wb?keyword=geography%20definition%20of%20commercial%20farming In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5fa2ca8d3e523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f9b46bed0677.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f87085b1619b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f99f1d451234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f9bfbf2afde3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_5fa2772954c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f9b9a2ca483a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f93486232558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f88b49ed2d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f91f915317c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f8cf7a186d12.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/kamedod.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/32e92811-4ecb-4e0d-b580-7ce0c8890ffc/rebokupiguma.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_off000077f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F6 5524 bytes
SHA-256: b609995d1bf834b43a834a1e5c5b184d7ebc807a8904f4b867cc5feae97df62f
font_01_sfnt_off00008aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA8 10332 bytes
SHA-256: 90c693ff49725d4a993973b105fe2a4d6c88f1b066fc156a9ea220e56e1b45dc

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