Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a82b4ebdefe01a…

MALICIOUS

PDF

39.0 KB Created: 2020-04-15 11:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3bf2fb882122abff55a036742d4de17 SHA-1: 917f62e06154dd7c31f284f7e3296e4b882b6df5 SHA-256: 05a82b4ebdefe01aea02e6b6e29346a9478928ef52a866108445d82ace572af3
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as a link farm designed to improve search engine rankings. One prominent link, disguised as related to 'Bloons Tower Defense 5 apk latest version', likely serves as a lure to encourage users to click and download further content. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

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://eastonkclothing.com/uploads/1/3/0/5/130551727/130551727.html#bloons+tower+defense+5+apk+latest+version
    • http://lifted-queens.com/uploads/1/3/0/6/130621447/8084642.pdf
    • http://graysonmurraygolf.com/uploads/1/3/0/2/130270882/5421163.pdf
    • http://techie-designs.com/uploads/1/3/0/2/130287914/1d41dc75ba8d55.pdf
    • http://aboutdeek.com/uploads/1/3/0/8/130815124/xutowowizeraviw.pdf
    • http://katebosch.com/uploads/1/3/1/4/131453121/xovetudubigi.pdf
    • http://xlentvibes.net/uploads/1/3/1/3/131380054/f0c5c.pdf
    • http://kanade-muroran.com/uploads/1/3/0/7/130739167/b60e94.pdf
    • http://kishkoinc.net/uploads/1/3/0/6/130620701/644986.pdf
    • http://adorespresso.com/uploads/1/3/0/2/130272569/jonukanu-zorided-sorugugako.pdf
    • http://didditt.org/uploads/1/3/0/8/130814189/tapemejedogaga_nepavotizatawan.pdf
    • http://m-d-engineering.com/uploads/1/3/1/0/131070858/2825049.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_off00006eec.bin
57157a822d919a9355caeacbf569a7b340f9688f58e1bfed282dcf0e35ac9ec2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEC 8028 bytes

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