Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ba790e31c66b9…

MALICIOUS

PDF

45.3 KB Created: 2020-08-05 14:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53ab9f27a2ed3c6c2ae5f5df4cedee86 SHA-1: 5b54588de3e53117ef239af226a6fb93093945a4 SHA-256: da2ba790e31c66b9dad3cd26830136232ad8af0a8d356feea0fb37d594e0367c
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=theorems+corollaries+lemmas+and+methods+of+proof+pdf', is designed to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other PDF links, indicating a link farm or redirection scheme. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

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=theorems+corollaries+lemmas+and+methods+of+proof+pdf
    • http://files.valetridents.com/uploads/1/3/1/6/131606260/2994862.pdf
    • http://files.davidmartinsstyle.com/uploads/1/3/2/6/132682471/2414572.pdf
    • http://files.someday-l.com/uploads/1/3/0/7/130738850/ba78a.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/71619107247.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/junakolabepe.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/rarifudo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/arachide_dfinition.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/81275092659.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/gogewo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/pufevufogafotaxor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2158/3004/files/can_t_download_from_google_drive.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aba.bin
813550ace9b3c15a5cd73b7c293f82aed9eb11405a90165fd6623cf312de5445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABA 5344 bytes
font_01_sfnt_off00006cbb.bin
14a9e3468c613151b16b01911238f3da5d47a08078d73c48b5f2da653b8af8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 10352 bytes
font_02_sfnt_off00009033.bin
cf82d832016c7908a6e90583c4ba59dae85b18f5b13a4ac42a4bc5a843ed4ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9033 16780 bytes

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