Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bc7a1bb29842d7…

MALICIOUS

PDF

62.7 KB Created: 2020-03-15 03:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1adb7407c616b2e0d24a2514dc4cfb29 SHA-1: 1cc7145d30cf80338ddd5949105bb1695e031001 SHA-256: f9bc7a1bb29842d75a2a24c2529fca7c3b5a9d908eb9bd6065a431b58726c6cc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file exhibits characteristics of a link farm, with a significant number of external URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to a multitude of potentially malicious or SEO-manipulated content hosted across various domains.

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://zhl.brdge.org/uploads/1/3/0/7/130776590/130776590.html#neoclassicismo+em+portugal+pdf
    • http://cpanel.chuivf.com/uploads/1/3/0/5/130551222/77c36b4704.pdf
    • http://www.deadrabbitbikes.com/uploads/1/3/0/8/130813141/rubapa.pdf
    • http://www.dramband.com/uploads/1/3/0/6/130603916/3018986.pdf
    • http://editor.bz/uploads/1/3/0/7/130740187/zaximetemewopujo.pdf
    • http://4dverse.com/uploads/1/3/0/2/130273842/9241013.pdf
    • http://dragontreemarketing.com/uploads/1/3/0/6/130640018/da17acd867ab6e.pdf
    • http://litbandit.com/uploads/1/3/0/7/130776454/feworudovunivot_tonutofisevazex_wemonanutaj_xefunipava.pdf
    • http://mikaelmonk.com/uploads/1/3/0/2/130289205/9093529.pdf
    • http://www.themobilestorage.com/uploads/1/3/0/9/130969920/zinovivamizugudanup.pdf
    • http://bearsversusbabiesgame.org/uploads/1/3/0/3/130313208/xezomukuwojobiv.pdf
    • http://www.marie-louphotography.com/uploads/1/3/0/5/130541733/fc9ff0.pdf
    • http://russellmainardi.com/uploads/1/3/0/9/130969481/7363941.pdf
    • http://iclaudiainc.net/uploads/1/3/0/7/130739968/romulax.pdf
    • http://www.katetripalin.com/uploads/1/3/0/3/130379204/3772818.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd44.bin
ff02e1ff280a19261e7595cdde06477654890916e24dda109628f4892125f8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 11124 bytes
font_01_sfnt_off0000e13b.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 2652 bytes

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