Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4aac38c3aa8d26…

MALICIOUS

PDF

39.8 KB Created: 2020-04-13 16:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cbddbccdbee63711d9be6b790c08ff85 SHA-1: 4afce91d6093a05f20ec642ef1eae697476dad34 SHA-256: 8c4aac38c3aa8d26fa7d619115a64c3ea51924482a2db2b8ae566d17e0b17a53
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to various domains, a pattern indicative of a link farm or SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Cazadora de hadas pdf español' and mentions 'wkhtmltopdf', suggesting a lure to download a PDF. The primary attack vector appears to be directing users to a network of suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zephyrhome.com/uploads/1/3/0/9/130970009/130970009.html#cazadora+de+hadas+pdf+espa%C3%B1ol
    • http://racialwar.net/uploads/1/3/0/4/130483510/kivumanikuno.pdf
    • http://wemadeamillionaire.com/uploads/1/3/0/6/130639629/pufus.pdf
    • http://riconrecoveryservices.com/uploads/1/3/1/3/131383760/kikolekoxotavoxiva.pdf
    • http://dataconversionfundamentals.com/uploads/1/3/0/7/130739080/lezikusugiruvos.pdf
    • http://jcmcewanlawyers.com/uploads/1/3/0/7/130775027/komorojabu.pdf
    • http://jodilynnthomas.com/uploads/1/3/0/7/130776740/wametuxesaroleleseri.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_off00006f86.bin
565b44544c822ed186879be8a9c8f6656c6b6b9910b5ea9f88671d7590b2d36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F86 9484 bytes

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