Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f60c9c3a45c723…

MALICIOUS

PDF

43.1 KB Created: 2020-08-05 01:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b85681b9834598fd14d056d04547f131 SHA-1: ec4a582c41507a0aace21e561f5e7c804a234392 SHA-256: 20f60c9c3a45c7239e5459e50756b0d85f3e7c8ed5b6dced753d31167acfe636
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a biology question paper. The document also features a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to increase visibility. The ML classifier strongly indicates malicious intent.

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.com/pify?keyword=biology+question+paper+for+class+11+pdf
    • http://juzaz.vagabondgeology.com/uploads/1/3/0/8/130813612/zudanorixibedidari.pdf
    • http://files.precisecatering.com/uploads/1/3/1/3/131384374/dofijimurobu-gedinafudalume-vimalawut.pdf
    • http://muwone.huncreekservices.com/uploads/1/3/0/7/130738714/liwolixis.pdf
    • http://files.ingridbassettdermatology.com/uploads/1/3/0/7/130740510/webawudirolorunosud.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/zudamowonod.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/backpacks_of_the_commonwealth.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/rumagava.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/nuwave_oven_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/fisije.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7038/files/xegivusesozem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/goruf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/mitevokorugito.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/98791009646.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/feserovuxijubam.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/75908385146.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_off000067b5.bin
c4e59588dca36b3747e727b0cb76cd5883e58eb1996338c045789dc16be54e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B5 5652 bytes
font_01_sfnt_off00007b0f.bin
5ef7612e4a7e8c5a5bfc6a8b9bb4cd7da4e79f48757a47d90bf922356d3102d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0F 10640 bytes

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