Malicious PDF — malware analysis report

Static analysis result for SHA-256 0937db94f9314b3b…

MALICIOUS

PDF

79.6 KB Created: 2020-04-11 04:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f030d4df0c8d9841618ffbc7e5c21769 SHA-1: 31a97a333a17af66beb0bcec01fca18aab1048b9 SHA-256: 0937db94f9314b3bb3adddbe10decae6668d2ffef4cde7cc3ba1ad37974ae723
96 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a common tactic for SEO spam or phishing campaigns. The document body, though heavily obfuscated, contains a reference to 'A gamer's guide to pretty much everything fanfiction', suggesting a lure to attract unsuspecting users. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links further supports a malicious intent, likely to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://www.thetruthaboutmommy.com/uploads/1/3/1/4/131437313/131437313.html#a+gamer%27s+guide+to+pretty+much+everything+fanfiction
    • http://eyefinitymockpractice3.com/uploads/1/3/0/8/130873961/mawikuginifozamosana.pdf
    • http://desiresdream.org/uploads/1/3/0/4/130490245/fogofafano.pdf
    • http://albeson.com/uploads/1/3/0/3/130379213/ruwelovinoj.pdf
    • http://couchtimecocktails.net/uploads/1/3/0/2/130287279/1736162.pdf
    • http://idovideophoto.com/uploads/1/3/0/7/130739247/33c1df7161ed94e.pdf
    • http://reshave.fr/uploads/1/3/0/6/130639152/6913595.pdf
    • http://numihomes.com/uploads/1/3/0/8/130813586/bepunew.pdf
    • http://allincardhousesa.com/uploads/1/3/0/2/130271117/fisomakun.pdf
    • http://photolab787.com/uploads/1/3/0/2/130289185/5542449.pdf
    • http://faithinbrookfield.com/uploads/1/3/0/3/130313360/fudutugesunokako.pdf
    • http://thehuffproject.com/uploads/1/3/0/3/130313507/tetav.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_off000111f4.bin
7744f9a2f5089c4ce55206611d8a05b3cee36698076a8084fdfbe97d06faa6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 8284 bytes

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