Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cf821a15c124aa…

MALICIOUS

PDF

52.3 KB Created: 2020-03-20 06:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0ff958589efd542414196f980252e7c SHA-1: 6c78024cc29940a02b5d5802a64ab00c041a3eb5 SHA-256: 77cf821a15c124aaff950a1ed923dc603f86f1092e60c15749961f6310b5063f
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristic findings, suggesting a coordinated effort to distribute content across multiple domains. No scripts were extracted, but the sheer volume of links points to a content-distribution or redirection attack.

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://onkoyoga.com/uploads/1/3/0/7/130739170/130739170.html#user+guide+nikon+d3000
    • http://www.smilingheartrebels.com/uploads/1/3/0/7/130775702/sujirebifi.pdf
    • http://balance-your-nutrition.ca/uploads/1/3/0/3/130313494/gemexakewus.pdf
    • http://katharinaundsven.com/uploads/1/3/0/2/130287472/tazoduzej.pdf
    • http://vote-o-matic.org/uploads/1/3/0/5/130551202/276290d6bb1e.pdf
    • http://nevadarapidcash.com/uploads/1/3/0/3/130313235/7494904.pdf
    • http://myfish.tw/uploads/1/3/0/3/130313224/4761703.pdf
    • http://arborologytreecare.com/uploads/1/3/0/6/130605143/famudibazam.pdf
    • http://aesadministration.com/uploads/1/3/0/4/130477252/0f35c.pdf
    • http://www.adelaidemaintenancesolutions.com/uploads/1/3/0/3/130313000/wadaxun.pdf
    • http://www.goodsamnow.com/uploads/1/3/0/7/130739260/5f63164657bf5ab.pdf
    • http://misskaty.org/uploads/1/3/0/4/130478205/9c723ea7764b.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_off0000a35d.bin
ea096525eefdf1893de166ff1b21e9403a45daf04c66411151a172921212e5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA35D 8992 bytes

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