Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff5281d63499ad1…

MALICIOUS

PDF

33.5 KB Created: 2020-06-12 06:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02f1ad3f68d0989f57d0dc9d96116947 SHA-1: 3fedb2334187b22652ca6c5f778025bb0063ede0 SHA-256: 5ff5281d63499ad1c8943e9a34271f047bf8b8422747ce900d103e13802cbac6
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to external sites structured as PDFs or HTML pages with numeric slugs, indicative of a link farm or SEO spam. The document body text, though partially corrupted, includes phrases like '400 pics quiz answers' and references to 'wkhtmltopdf', suggesting a lure to entice users to click on these links. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links supports the conclusion that this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mariasmaidcleaners.com/uploads/1/3/1/4/131452872/131452872.html#400+pics+quiz+answers
    • http://brandinfrancis.com/uploads/1/3/1/4/131453365/wubusufukab_limanofagi_sefigoluwo_wawovuk.pdf
    • http://1stchoicecarpentry.com/uploads/1/3/0/7/130776592/moxowasejire_tasoj_zilatenigal_wagusezufejiso.pdf
    • http://forb-learning.com/uploads/1/3/0/4/130435578/perezupofak_lavololesu_vezisut.pdf
    • http://katiekerwick.com/uploads/1/3/1/4/131437953/laguxejenem-kidupolid-viwifasudo.pdf
    • http://babydollcarek.com/uploads/1/3/0/6/130604048/9010905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tizamugoli.files.wordpress.com/2020/06/8904925830.pdf
    • https://jarojadum.files.wordpress.com/2020/06/manonakewovelet.pdf
    • https://watozidubiba.files.wordpress.com/2020/06/1734472844.pdf
    • https://wipafuvuz.files.wordpress.com/2020/06/31935465430.pdf
    • https://metifufap.files.wordpress.com/2020/06/63902833431.pdf
    • https://dinijomerawo471198499.files.wordpress.com/2020/06/30312250624.pdf
    • https://xatusowafim.files.wordpress.com/2020/06/66835225094.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057cf.bin
998ab81fb83c653da50647df6ee1bdaa74d77e683b2ee9a97a657513bf0d48a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CF 10404 bytes

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