Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6bfe46fe1c5d2e…

MALICIOUS

PDF

46.5 KB Created: 2020-11-09 00:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6198732e675280b1a3200d837cddb4 SHA-1: 1a99c99fc0d8d7ca5bb6f4fbfa3a88583745a42f SHA-256: 4b6bfe46fe1c5d2ec661a77280dd7f3c3f9c476212d337bf630f8b57d1790a8b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links to external websites, a technique often used for SEO manipulation or to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies a large number of external PDF links, suggesting a coordinated effort to generate traffic or distribute further payloads. The ML classifier also strongly indicated maliciousness.

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://trafffi.ru/123?keyword=ib+unit+of+inquiry+display
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/9846780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://towadababaf.files.wordpress.com/2020/11/overcoming_fear_bible_study.pdf
    • https://s3.amazonaws.com/dinisemowoge/88637073862.pdf
    • https://s3.amazonaws.com/juvuwaterexaf/grand_theft_auto_5_apk_download_android.pdf
    • https://s3.amazonaws.com/zetare/padekotomitu.pdf
    • https://jopafez.files.wordpress.com/2020/11/80044578415.pdf
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdf
    • https://bamadebib.files.wordpress.com/2020/11/lotositomowewusuwixiz.pdf
    • https://podawigiwoko.files.wordpress.com/2020/11/46514913863.pdf
    • https://nofagixonuva.files.wordpress.com/2020/11/pudexugotufoxori.pdf
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076d4.bin
f8c9a2082a6705b0483a9504424a280cbff6fd3e1e81b0dcb97342311ceded56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D4 5340 bytes
font_01_sfnt_off0000890b.bin
1f6b2a874c3503ba438b11ca0b858a75f813443e111a3d4736cff5161ff8a031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890B 10632 bytes

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