Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be096bc7e9a2655…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43d614efac2b73cde1925b017daa5fca SHA-1: 586a633de8ac189d7fa005942959923ae138d764 SHA-256: 7be096bc7e9a2655b125e6d2ead9f29a01f07e8fab04b36f552e2f335460d094
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is disguised as a free download for 'a thousand years piano instrumental mp3'. The document body, though heavily obfuscated, contains this URL and references to wkhtmltopdf, suggesting it was generated programmatically to host these links. The primary intent appears to be directing users to the malicious 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=a+thousand+years+piano+instrumental+mp3+free+download
    • https://static.usrfiles.com/ugd/b8c837_5e91c8ffad224240b9b6ae6b2fc36491.pdf
    • https://static.usrfiles.com/ugd/c63dba_463e461e64134a3d835f6c122e71138b.pdf
    • https://static.usrfiles.com/ugd/6846fe_937c5a4bef294ee98018de9e8ad27ba9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0fd2484c14884def85a5fb0ec61fbfc7.pdf
    • https://static.usrfiles.com/ugd/822ecd_9323600ccae042feaad4e0a623e2f30f.pdf
    • https://static.usrfiles.com/ugd/fd7405_c126e9153bcf4429842362528667d779.pdf
    • https://static.usrfiles.com/ugd/bb13a2_f6487a6197fc4847b11d3685eaf62b6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7471b1917eb94287b999ede0c3e7c742.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/43472294248.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/linarojilujunovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/bharat_acharya_8086.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/excel_bar_graph_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/0181/3915/files/first_grade_phonics_worksheets_printable.pdf
    • https://static.usrfiles.com/ugd/3bf302_fa10def0036c401e8b308d0e323eb462.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b7f69f54454e3f9f877e93227c4a94.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_off0000732c.bin
a6106e9a2ff1a42ab8b4cc9c3f25b150dc03d7e75eb910da0058eed45c3f981b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732C 5628 bytes
font_01_sfnt_off00008639.bin
b3222949b6970f6f15f785da5afd1ebcda35ffd1d5083dcacfb684670292d3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8639 10236 bytes

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