Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4f5b07aac4ad0c…

MALICIOUS

PDF

30.0 KB Created: 2020-04-18 21:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2dd26d42e73dc28b0d78766aea9d1d37 SHA-1: e49e15d236a3ed92c4e7add44a1c48d051737f91 SHA-256: 6b4f5b07aac4ad0c83e4729f0acabfa8c4fdc23ed60a126ab6406430b4182a82
136 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a malicious intent to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the sheer volume of external links indicate a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://cafetwocann.com/uploads/1/3/0/8/130874314/130874314.html#basha+movie+dialogues+ringtones+free
    • http://essentialmeltz.org/uploads/1/3/1/3/131381045/bowogeboledemuz.pdf
    • http://altasanacion.net/uploads/1/3/0/7/130740133/37bfbe23.pdf
    • http://www.proedge406.com/uploads/1/3/0/8/130874437/4f840accf.pdf
    • http://ucftakesnyc.com/uploads/1/3/1/4/131453194/4772999.pdf
    • http://met-wilderwood.com/uploads/1/3/1/4/131408741/9915199.pdf
    • http://islanderlocksmith.com/uploads/1/3/0/6/130621969/rikawori.pdf
    • http://rubberchickengraphics.com/uploads/1/3/0/5/130588377/devolisuladumep.pdf
    • http://kimberlinclass.com/uploads/1/3/0/7/130740128/sajusawimoge_manofukofalame_ruzajesoxip.pdf
    • http://mamabeingyoga.com/uploads/1/3/0/3/130324419/renugalidobef.pdf
    • http://napervillegardenclub.com/uploads/1/3/1/3/131379639/1988186.pdf
    • http://imaginify.net/uploads/1/3/0/3/130379141/rukokitopuwi-mabosegakolit.pdf
    • http://allqualitypro.com/uploads/1/3/1/4/131437693/pefuva-gizofuvo.pdf
    • http://fourcornerstribalbusinesscorporation.com/uploads/1/3/0/4/130435857/duwigewo.pdf
    • http://amitaysadovsky.org/uploads/1/3/1/6/131637279/fakinizaroda-fajamupudu-fodaji-todorigagote.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f73.bin
b20a89c598cccee1e8052a4210ff3417b7c8384242c261db65d2b4cfe3f81f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F73 7100 bytes

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