Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f06c285c6121fc…

MALICIOUS

PDF

43.8 KB Created: 2020-11-07 10:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a8db11bf769cf8666c03726a3220291 SHA-1: 57decdeb3996ae4b0426d3ad9d2678b1e7dae97b SHA-256: b8f06c285c6121fc949bd01fd7c11fc7e08191401e03d3b9d73fa9319bac3594
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to other PDF files. The document body contains obfuscated text and a URL, suggesting an attempt to manipulate search engine results or lead users to malicious content. The presence of multiple external PDF links indicates a link farm or a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?keyword=ffxiv+goldsmith+guild+location
    • https://cdn-cms.f-static.net/uploads/4477173/normal_5fa590740479a.pdf
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f88515858e3b.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f90b0ae02032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/suxugipipolazog/smart_guide_to_the_bible_series_list.pdf
    • https://wisevojinu.files.wordpress.com/2020/11/99911785433.pdf
    • https://redasiwum.files.wordpress.com/2020/11/poredumevimuz.pdf
    • https://zaninudazune.files.wordpress.com/2020/11/jexunekazesixikupatapuzuw.pdf
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdf
    • https://s3.amazonaws.com/pazifetanegapu/creature_from_jekyll_island_free.pdf
    • https://direpupiwabe248790905.files.wordpress.com/2020/11/10856063596.pdf
    • https://s3.amazonaws.com/fujadabez/uk_blank_map.pdf
    • https://s3.amazonaws.com/wewuxuviwar/zujizunidivizagu.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_off00005f54.bin
c14a7c5dbf9ad4c3060d8490984b75ac96c8a31eeafabe5ecf64168938363557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F54 5184 bytes
font_01_sfnt_off000070e2.bin
80b021d779dfb5a1102b4453d9117a517a0b1fb311786113ffc7be32518ddd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E2 10440 bytes
font_02_sfnt_off00009480.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9480 4324 bytes

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