Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c87add91b427305…

MALICIOUS

PDF

42.5 KB Created: 2020-04-18 16:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 290cbc815e220e92927c88c6d5dacb1e SHA-1: a738999f6e4b9758ba54218c7b86089ee84399f7 SHA-256: 4c87add91b427305571819639f394feca9c7a65a83020bad94caff01edf1eb64
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as SEO-optimized URLs pointing to potentially malicious content. The document body, though heavily obfuscated, contains text referencing 'Cnn business reporter' and 'wkhtmltopdf', suggesting a lure to trick users into visiting these linked sites. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of it being used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hopefulkc.com/uploads/1/3/1/1/131163747/131163747.html#cnn+business+reporter
    • http://treasuredbydesignllc.com/uploads/1/3/0/8/130813740/luxoribopija_kapax_wowuborozekigob_jewovenibiw.pdf
    • http://ik-jij.com/uploads/1/3/0/8/130814735/wosuvona_tipijixo.pdf
    • http://customsoundvision.com/uploads/1/3/0/5/130544295/dedunodemafazumug.pdf
    • http://uspaaonline.org/uploads/1/3/0/2/130287938/kusesasozo.pdf
    • http://shopity.space/uploads/1/3/0/2/130288421/652147.pdf
    • http://4bettergifts.com/uploads/1/3/1/4/131454984/bunewudiduk.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_off00007def.bin
eacdcc09914ea9de99c999ce04d9e7114283822c5c3b49c30e9e2f291d4dc57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 8608 bytes

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