Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a94d6726e160b17…

MALICIOUS

PDF

35.2 KB Created: 2020-04-11 20:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ecb3f81dda25aca2af041b1d035bee86 SHA-1: d1793759106e28a378d7d6709d233051056ba3c4 SHA-256: 2a94d6726e160b172ce54b1cd21f9d20cc50f403df4e54b89f1f9cac5e6e0327
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious with a high probability. It contains a significant number of external links, many of which point to domains that appear to be part of a link farm. These links are likely intended to manipulate search engine rankings or to redirect users to malicious content. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://michaelwellsart.com/uploads/1/3/0/7/130739923/130739923.html#parachute+assassin%27s+creed+brotherhood
    • http://melaniemariejeanne.fr/uploads/1/3/1/4/131453676/kudanuxilasedid.pdf
    • http://litturi-photography.com/uploads/1/3/0/4/130477085/08e58aa38c.pdf
    • http://happycamperllc.com/uploads/1/3/0/6/130620689/4490459.pdf
    • http://paseoenhelicoptero.com/uploads/1/3/0/8/130814192/6782196.pdf
    • http://usddbill.net/uploads/1/3/1/3/131384058/xowuwame.pdf
    • http://mceducationconsultant.com/uploads/1/3/1/4/131407493/244aac0fef7a30.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_off000060e7.bin
79f2d142b43b9137d53b7df2807fcd33126810e8cd987301bdb818e0b836018e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E7 9136 bytes

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