Malicious PDF — malware analysis report

Static analysis result for SHA-256 c352088ba0b1f37a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 01:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf37ee6742db4fa527fe05343b20564 SHA-1: d73614f9912af37b2368f34f7d810784ef4503b9 SHA-256: c352088ba0b1f37ad8479932a9f25b8ab0241865ce4e7e2a7ccfd2cff803454a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains keywords related to educational materials and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic to the malicious redirector. The ML classifier also 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/pify?keyword=glencoe+algebra+1+textbook+pdf+answers
    • http://files.professionalscissorsharpening.co.uk/uploads/1/3/1/4/131453188/6409a8b001d27.pdf
    • http://files.orwormworks.com/uploads/1/3/0/7/130775707/vinibiwevi.pdf
    • http://files.australiannationalrabbitcouncil.com/uploads/1/3/0/7/130739165/6826420.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/dinikagupedovolijib.pdf
    • https://cdn.shopify.com/s/files/1/0431/0020/9319/files/mexixogazug.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/factoring_quadratic_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tusag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29318048561.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/jesunus.pdf
    • https://cdn.shopify.com/s/files/1/0439/2416/0667/files/55623967550.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/59895136821.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/78946105513.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/49768080743.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_off00006040.bin
9579c95133759604f421b38a5fa4a57d867d065e3016279e6d5270d14a70198a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 5772 bytes
font_01_sfnt_off00007418.bin
493254b67be28c3f4d5141cf2f350f01d57beea8bf2874d122b11d1009652e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7418 9692 bytes

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