Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b37335e47b60bf…

MALICIOUS

PDF

41.1 KB Created: 2020-08-29 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55044a64ed76f6507d5d93ae2af263fd SHA-1: c33acfb688a5c25be5b34a65fee73b41b2129922 SHA-256: 83b37335e47b60bfb0a7f2433da6f50dbbbe6c2430d95f323ca08747fcdfed9a
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the embedded URLs, 'https://ttraff.cc/wix?keyword=dutch+bonnet+napkin+folding', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The file's creation by wkhtmltopdf suggests it may have been generated programmatically for malicious purposes.

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.cc/wix?keyword=dutch+bonnet+napkin+folding
    • https://static.usrfiles.com/ugd/b8c837_fab79a6cf2c04f6d8e323205cf5fa476.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce0492239dc14be7ba85c600cdf4dae1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae1002feafd14e38a9b8b3d76a79c158.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/nawugezalesijedabezogiwok.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/24142583618.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/ping_pong_ball_joke.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/kajaria_tiles_rate_list.pdf
    • https://static.usrfiles.com/ugd/b8c837_660e91e05a264cf58167280eab440006.pdf
    • https://static.usrfiles.com/ugd/d3758e_e0da070a1e8144698f7ac489c9dd1cdd.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/autism_speaks_100_day_kit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/audited_financial_statements_format.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/74654394027.pdf
    • https://cdn.shopify.com/s/files/1/0464/6574/5054/files/bal_krishna_bhajan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.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_off0000633a.bin
7f7b2b329637bcaf9201b02f58c27bb3bf1c46fbcf032141b9745d1cd18a92df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633A 5348 bytes
font_01_sfnt_off00007564.bin
df67ab64909f3dda39b90cadf933a26e93b54829e93e9434b2c8c54c3993ff67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 10044 bytes

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