Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb21f27cbd98779…

MALICIOUS

PDF

48.8 KB Created: 2020-07-19 04:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b25fe418a91490bbfb2dc2f776a284 SHA-1: b3d50e09b66adf2c93c119376ccbe71c976e8b09 SHA-256: 3fb21f27cbd98779d8d3a5d238bb5f5ddf04c70ce8d449df467d154b4bfc753d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO poisoning. One critical heuristic identified a direct link to a known malicious redirector infrastructure at 'ttraff.cc'. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure of a 'Sicilian defense opening pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.cc/wb?keyword=sicilian%20defense%20opening%20pdf
    • http://files.gibdevelopments.com/uploads/1/3/1/8/131871622/pudunigutegul_xuwozepeba_nojarew.pdf
    • http://files.haciendasonoma.com/uploads/1/3/2/7/132740218/7130198.pdf
    • http://files.pgtool.com/uploads/1/3/2/7/132710690/tabamijopojijesefi.pdf
    • http://files.keystonetrucks.org/uploads/1/3/1/4/131437172/9847d5ef4d3.pdf
    • https://xugipoxuwigo.files.wordpress.com/2020/06/wenidinebebon.pdf
    • https://numuwaxuwilo94341109.files.wordpress.com/2020/07/somovanavulo.pdf
    • https://rinasizovip.files.wordpress.com/2020/07/39888865892.pdf
    • https://loralamodi.files.wordpress.com/2020/07/22465141876.pdf
    • https://jefogusiku.files.wordpress.com/2020/07/pesaxowilejekorajufi.pdf
    • https://zozijonatoto.files.wordpress.com/2020/07/75704249716.pdf
    • https://kizutakogoz.files.wordpress.com/2020/07/16055324872.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/faras.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/71982920126.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/vafopato.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/taruxigired.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/6215804843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/70264939694.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7518/files/sajovebo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000823a.bin
da7d7a6c028375f38bfecd264493e3204d94a261f3fef7ab11e19c213e7bab81
pdf-font-stream PDF embedded font (sfnt) at offset 0x823A 5036 bytes
font_01_sfnt_off00009359.bin
e76b11a6bf89d3ccd875a7ddec4fde9ebd8c79da8d464e914efb53e3347793b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9359 10024 bytes