Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2cc3d414a87d8d…

MALICIOUS

PDF

46.3 KB Created: 2020-04-26 01:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35cc4c8c8912d59de1e869cd9c10f036 SHA-1: bc3f6303dcc77a06b6dda5d1bf455b07aef0b0da SHA-256: 9c2cc3d414a87d8d581c0f4a9fad94492903d21886fa4e59bd774823a73c146b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure. The primary attack pattern involves directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chichesterfootandankle.org/uploads/1/3/1/3/131398258/131398258.html#company+law+2013+quiz+questions+and+answers
    • http://homeschoolingsource.com/uploads/1/3/0/3/130312964/xazepalosibopajis.pdf
    • http://sterlingfelderfoundation.com/uploads/1/3/0/6/130620603/vubotuwarar.pdf
    • http://chicaandestrellahandmades.com/uploads/1/3/0/5/130540049/7e92ea81b828.pdf
    • http://memoryrecoverymethod.com/uploads/1/3/1/3/131380609/fc202.pdf
    • http://lockdown-lockout.com/uploads/1/3/0/3/130379146/2cd5bb48a862a64.pdf
    • http://connectedvitality.org/uploads/1/3/0/3/130379341/narekelilusiva.pdf
    • http://clickbation.com/uploads/1/3/1/3/131380992/safisakivuwesaxedore.pdf
    • http://bemisconsulting.com/uploads/1/3/1/3/131380583/suwewuxejexi_kojex_zamikazi.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_off00008a75.bin
20dcfe3cf47905fab92f9e58a61fe01ea44588c88170b856734692cf79e3b8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 8664 bytes

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