Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07a5824547b339b…

MALICIOUS

PDF

42.7 KB Created: 2020-04-07 09:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23328991a39c05221d5dbd1abc989665 SHA-1: 2a9c36ad472b32283b4a420064ea44e495db2b8c SHA-256: a07a5824547b339b0b687d0829fa3c94b9532144b733c6b06fba05864eae3993
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, employing numerous embedded URLs to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a delivery mechanism for further malware. The document body, though partially corrupted, contains a lure related to 'Tropical smoothie cafe menu nutrition facts' and references wkhtmltopdf, indicating it was likely generated by a tool rather than authored directly. No scripts were extracted from this sample.

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://incident-services.net/uploads/1/3/0/4/130488513/130488513.html#tropical+smoothie+cafe+menu+nutrition+facts
    • http://9f60fpk003.com/uploads/1/3/0/5/130539414/4176594.pdf
    • http://fee-frigolo.com/uploads/1/3/1/1/131164251/jejifidavorozu-lusugovilugized.pdf
    • http://genderrevealparty.de/uploads/1/3/0/7/130739119/divonimijetibas.pdf
    • http://life-cycle.net/uploads/1/3/0/4/130488172/dokasex-lorekin.pdf
    • http://gingerblogs.com/uploads/1/3/1/4/131438556/gataladeni.pdf
    • http://triviatoz.com/uploads/1/3/1/1/131164048/gejadakig_maroxutojilo_kuwatajomi.pdf
    • http://recoveringflautist.com/uploads/1/3/0/6/130620537/rijavuvide.pdf
    • http://leslithomas.com/uploads/1/3/0/6/130621995/nawupi.pdf
    • http://jcdudley.com/uploads/1/3/0/5/130539897/rizok_jobepil_vawiminovuna_dulevudibeki.pdf
    • http://bohconsulting.com/uploads/1/3/0/6/130639454/aa7ba0dcfba7b5.pdf
    • http://plazakora.com/uploads/1/3/0/7/130738814/pibal.pdf
    • http://lesleykimfineart.com/uploads/1/3/0/6/130604250/b84d409964b18.pdf
    • http://griefandwellnesscenterofdenver.com/uploads/1/3/0/3/130323630/tidikobawixaf_konepawej_pogesorivorituz.pdf
    • http://joesdawgs.com/uploads/1/3/0/6/130621483/vibare.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_off00007c20.bin
73939c560e89ac294a365785086cfc4cb5c4e79b48c2016b5fdb2ac217fc8f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C20 8868 bytes

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