Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fded2f109e5d30…

MALICIOUS

PDF

31.8 KB Created: 2020-05-15 05:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b766f7245085db9feeabfa434eb52bb5 SHA-1: a4ceff974740cfbff91cb94914f55cb7c4e8c7b6 SHA-256: d2fded2f109e5d3083900fbc70b48e70dae7f23fba8e922fd058962d32488105
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on domains related to SEO spam. The document body, though partially corrupted, contains text related to Excel VBA and mentions wkhtmltopdf, suggesting a lure to external content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results. The primary intent appears to be driving traffic to these external sites, likely for phishing or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://sbcsjn.com/uploads/1/3/0/6/130604101/130604101.html#copy+and+paste+sheet+in+excel+vba
    • http://technonarrative.com/uploads/1/3/0/6/130603683/nesefabujipixan.pdf
    • http://heartfeltrituals.com/uploads/1/3/0/8/130874339/e86f60d58.pdf
    • http://myblackenterprise.com/uploads/1/3/1/8/131871405/958245.pdf
    • http://battleaxstrategies.com/uploads/1/3/0/6/130604512/lunobojedusa.pdf
    • http://andersamundson.com/uploads/1/3/0/5/130589442/6b5fe6.pdf
    • http://lightdoneright.net/uploads/1/3/1/4/131483386/gofamore_jejazoruviligip_kijow_wetelajowa.pdf
    • http://romansolopov.com/uploads/1/3/0/5/130588157/mulofekatevidodiniw.pdf
    • http://networkinhopkins.com/uploads/1/3/1/4/131408033/xadalegobod_bufefopuse.pdf
    • http://insideoutkitchenandbath.com/uploads/1/3/0/2/130288391/a267a031e3a7.pdf
    • http://westshorelogisticscenter.com/uploads/1/3/1/0/131070009/subepedifeb.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_off000051e6.bin
45e87a8f96cbee9ca013d95e59924861b6abe3baf5cd8e47eeab8b4c8c3abc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51E6 10024 bytes

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