Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4e4e5acacad1c8…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 07:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c85fbc14d25db264ce5551f5d120d6a SHA-1: 823e5d8f8156db2cc0d69385509dd3da31d567c5 SHA-256: 8a4e4e5acacad1c84e2ede99492f8eccaa272fa170cec6f6ba0e4641c4ca67ca
120 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 text related to 'Inference practice worksheet 1' and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of numerous embedded links, many pointing to static.usrfiles.com, indicates a link farm strategy, with the primary malicious link being the redirector.

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=inference+practice+worksheet+1
    • https://static.usrfiles.com/ugd/3bca44_53baf1fc6e60425c9870844afa966216.pdf
    • https://static.usrfiles.com/ugd/b6edda_41a5e3dee20844a5a9ca19795a8d36bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_80ed5782f88e4ec5ba645ee0d45e12b7.pdf
    • https://static.usrfiles.com/ugd/3e9e83_8798826e8cf24ca3b934027f773ae6c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e2117e68b004dbc897498a972b48566.pdf
    • https://static.usrfiles.com/ugd/3aca14_3d3c64520cba437fad8039d9d3779177.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/whatsapp_plus_apk.pdf
    • https://cdn.shopify.com/s/files/1/0463/4027/6381/files/define_formal_functional_and_perceptual_regions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35403674757.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/63512497561.pdf
    • https://static.usrfiles.com/ugd/5bb01c_beb62c6a375b4e9db7fa479bfbfa322b.pdf
    • https://static.usrfiles.com/ugd/c8a981_359204147ea54efdb1d8720280fb16ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d364c43a68e4f07b13599ffe54ea286.pdf
    • https://static.usrfiles.com/ugd/dba42a_c834462c12324c7e819de8e87f870f29.pdf
    • https://static.usrfiles.com/ugd/e5412a_2d7af46488b34b99a6227005a5ec796e.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_off00006192.bin
8a91e8cc4473033dfb525acdadbfc2c6be20fc7105b2d7b1a44c7b0cf2a5cd97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6192 5216 bytes
font_01_sfnt_off00007369.bin
9b62454726a6082451d931264690d29d09bef15c06d947533f8e448c759cd164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7369 9704 bytes

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