Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa7adcaa4dfcc58…

MALICIOUS

PDF

50.9 KB Created: 2020-11-03 18:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 348becd0bb39ba8b8a09d21e7b176094 SHA-1: 16777d651836c55c9b35ccc34ab9ad375daf924a SHA-256: daa7adcaa4dfcc58f2c37206f01535bcae77a1344a84c667397f3aba8b6ca62b
124 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 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://cctraff.ru/strik?keyword=megaman+x4+boss+weaknesses In PDF document text
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/nedetadepavume.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/xepesoxetas-kaxok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f8b6cac1c23d.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/kerij_bumozagawavaja_mojuj.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/712e5af8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f95fbc89f5ac.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/003e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_5f9c97eb1308d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/mebejunisapaxijotisusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e52584-d367-41d4-891f-8f9f7e99da16/telovinuzita.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/dreams_by_langston_hughes_critical_analysis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 13072 bytes
SHA-256: 57e1df913108a38a5ae1890a1a4fc1dcd67e10270f22fe61a83f9c6f762b8f3d
font_01_sfnt_off00008844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8844 5332 bytes
SHA-256: 4bd0d8e2d7564a9929fa1c7a882b4bd871d12261ff9382bda9d79bd7c9f3e949
font_02_sfnt_off00009a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8B 10708 bytes
SHA-256: 741e86b1819c2cad7a8b546062bbf212022ac9995147781820bed53eb1384098

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