Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ff31d15715bc77…

MALICIOUS

PDF

81.1 KB Created: 2020-04-02 05:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d017d097cfe5f36ae3907198281419a1 SHA-1: cc383114fc3b103eaab417f47e9fadd222e5fa28 SHA-256: e0ff31d15715bc77cb440edf5d7697f323861af1c395cfd24ede1e819a46249a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs point to domains commonly associated with distributing malicious documents. The document body itself is heavily obfuscated and appears to contain metadata rather than user-facing content.

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 http://puppybuilder.com/uploads/1/3/1/4/131453464/131453464.html#long+way+gone+summary+chapter+12
    • http://juansosairrigation.net/uploads/1/3/0/4/130483959/nadefufil_towipolasozod_sakori_sabuxeson.pdf
    • http://makingmoneyandmealbyfive.com/uploads/1/3/0/7/130740082/7446e16675.pdf
    • http://ngtmedia.com/uploads/1/3/0/4/130476594/2103561.pdf
    • http://popandolive.com/uploads/1/3/0/3/130312961/voveporijobuz.pdf
    • http://sportmufukarbantartas.hu/uploads/1/3/0/9/130969358/gokakabixojine.pdf
    • http://shannanstanciuforschoolboard.com/uploads/1/3/0/8/130873841/e67de56511.pdf
    • http://weltanschauen.com/uploads/1/3/1/0/131071041/fb138a6fb0cf307.pdf
    • http://paintingbunbury.com/uploads/1/3/0/8/130874352/ad1a51071087eaa.pdf
    • http://maidinjersey.net/uploads/1/3/0/3/130379397/faxomaj.pdf
    • http://newsmapper.org/uploads/1/3/0/2/130273915/wirulewu.pdf
    • http://jinnyfosterphotography.com/uploads/1/3/0/4/130435562/sebebalebir_wemogunixafe_bawirebo.pdf
    • http://industrialtablet.ca/uploads/1/3/0/2/130272905/4617486.pdf
    • http://serenityhumanservices.org/uploads/1/3/0/5/130588798/d0d94e2.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_off00011898.bin
218d9f753600063b8f69769fe30176283af0a1b30b8601b99961c233397f2820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 7848 bytes

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