Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9158d9e519d1595…

MALICIOUS

PDF

38.6 KB Created: 2020-08-07 22:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fab2bad5651ae8095e4ee59001090c5 SHA-1: 552f418349b7dc413d54c8a22574f8ce9cd2bb3a SHA-256: c9158d9e519d159500389f4817f77c32f27158b58d2515589ee72bade175d341
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Acca f9 study text pdf 2020 bpp' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm SEO strategy to distribute the malicious content.

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=acca+f9+study+text+pdf+2020+bpp
    • http://files.smarttournaments.com/uploads/1/3/1/4/131438464/sogus_wonozafibo.pdf
    • http://files.icewaterrecovery.com/uploads/1/3/2/6/132681670/4845144.pdf
    • http://xexabeza.1872platbook.com/uploads/1/3/0/7/130738914/1573219.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2523/files/vazetubowawekoxivojavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/sasogeratopiguvuronos.pdf
    • https://cdn.shopify.com/s/files/1/0435/0525/4566/files/lanthanides_and_actinides.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/72075130319.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/posadege.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/duvevugamidalopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/81282924591.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/pefumofogen.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_off00005669.bin
49037641dc6d1b1361e8ac5e3805b5035b0fe4bb5af044f55809cc4042b5713c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5669 5752 bytes
font_01_sfnt_off00006a1d.bin
e7c205ee28f4767ab728184ff08baaa2359f7a658bfe7a111e2c94c10e1d158a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1D 10444 bytes

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