Malicious PDF — malware analysis report

Static analysis result for SHA-256 a667314a7206431c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 12:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfe2ab37895eb219c9cf6abc47523ca SHA-1: 9cb098847ee95efc8951b1baee9768c97eb0888f SHA-256: a667314a7206431ceccd8d29268561d173d03752771235aa1cac1d1c0f1337f3
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One of the primary links directs to 'ttraff.ru', a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure and embedded links strongly suggest a social engineering attack aimed at redirecting users to malicious infrastructure.

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/pify?keyword=axle+load+calculation+spreadsheet
    • http://fewem.acaringcommunity.com/uploads/1/3/0/7/130775518/bupixudoli_tumafiguri_nenape_moxud.pdf
    • http://woxikodi.current-wellness.com/uploads/1/3/2/6/132682883/d04ceffa5dd022.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/birewilowal.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/lotukorunup.pdf
    • https://cdn.shopify.com/s/files/1/0435/1950/8634/files/96395145255.pdf
    • https://cdn.shopify.com/s/files/1/0430/3041/3475/files/formal_business_email_format_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/wuwozo.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/addison_wesley_math_makes_sense_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/64027601323.pdf
    • https://cdn.shopify.com/s/files/1/0438/2448/0416/files/rupozusukex.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/85253340645.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/45246280854.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_off00006a64.bin
aee31fc0b59456b989e3ed7953a386352a3faa597f44eff07635bb9311fb82d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 5216 bytes
font_01_sfnt_off00007c16.bin
f6b65c80bc554ad6322b682d0fa5297ced5d19f23c17cc11148aaf1ef943d095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C16 9844 bytes

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