Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ac277ef303059a…

MALICIOUS

PDF

88.1 KB Created: 2020-08-30 19:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26cd677072ce1c523f20a5c42b18a23 SHA-1: f5c6e901f508e2a9d8ec7473570151cd8969914d SHA-256: 85ac277ef303059a4056fd73b75db162bcb25bb986ef3d32f8bd87cad7a2fbef
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=modern+magick+12+lessons'. This URL is likely part of a phishing or malware distribution scheme. The file also exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are benign Shopify URLs, but the primary redirector is malicious. The ML classifier strongly flagged this PDF as malicious.

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.ru/wix?keyword=modern+magick+12+lessons
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/beginning_intermediate_algebra_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5281/files/after_effects_countdown_expression.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/aafes_fuel_surcharge.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/kepipijemesupajo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/92215998650.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bb0aa797b79453199425b3cda0fafb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_840c998e62d1411aa2b658ad8e510841.pdf
    • https://static.usrfiles.com/ugd/cc089a_f4e71246d0cb41e4b005b75775e08553.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/niwezaguvuzoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/bekosofutirazetodin.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_off00011336.bin
3eec1efc4c3f4f1114f3d4893d93b461fbfe6f619db8e7589b7f39a04b778aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 5512 bytes
font_01_sfnt_off000125e7.bin
a4e1ed5f7feeafa52b50f23e6b2d1748aa9a445643b697dd1d81224922216a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 14824 bytes

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