Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd408a56ddc45ce…

MALICIOUS

PDF

35.2 KB Created: 2020-05-20 00:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 763d8a826e0c68e9b9259b412927fae4 SHA-1: 1d868959e04b15b90979484a60aa64f4e3ddfb17 SHA-256: 6cd408a56ddc45ce04098eb52b80581fe58d64b7fd3f481a2f058148631ec605
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or host malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://missfajascolombianas.com/uploads/1/3/1/1/131164021/131164021.html#las+almas+de+brandon+poema+cero
    • http://sunshinestateadventures.com/uploads/1/3/0/4/130476976/fovulesoleku.pdf
    • http://hoainsurance.co/uploads/1/3/0/4/130435583/c58441d41.pdf
    • http://cozychristmasbook.com/uploads/1/3/0/8/130874015/ponazivik.pdf
    • http://jesusgirlsconference.org/uploads/1/3/0/8/130814788/momotitujemure.pdf
    • http://mtnathletics.com/uploads/1/3/0/6/130639998/996d866.pdf
    • http://wearecreative.org/uploads/1/3/0/7/130740048/880071391a679.pdf
    • http://oxforddayschool.org/uploads/1/3/0/8/130874634/2a506.pdf
    • http://fitmattersllc.com/uploads/1/3/0/5/130539128/72a3b0d0ca614ac.pdf
    • http://michaelpenkas.com/uploads/1/3/1/6/131636872/9a0abc22d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c74.bin
b2b5d761f3af6839689ddf734484d677d8bbf98f68df5d04ef88bd5136a24f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C74 11048 bytes

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