Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dca9e1c9a13f14…

MALICIOUS

PDF

38.1 KB Created: 2020-09-01 05:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 796921b4500c1a728c7097a32fd485ed SHA-1: 0362a1fc6892344b4d21788c2bc091faa1e6efc3 SHA-256: 27dca9e1c9a13f1401be218db27754636ee046ced0d8e32bc919f004703b3b27
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 a high density of embedded links. One critical heuristic flagged it as a PDF redirector link pointing to `https://ttraff.ru/wix?keyword=codingbat+java+answers`. Another critical heuristic identified it as a PDF SEO link farm, with numerous links pointing to `cdn.shopify.com` domains. The document body contains garbled text but includes the same URLs, suggesting a lure or spamming technique.

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=codingbat+java+answers
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/mitebiziguv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/calories_jersey_mike_s.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/relexas.pdf
    • https://cdn.shopify.com/s/files/1/0430/3604/9571/files/guitar_chords_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/zereninoxebavigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/33927878915.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/revilodan.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeb2c51e61864088a723f52a2f679481.pdf
    • https://static.usrfiles.com/ugd/696b8a_2880de251f7d4d538fbd62d08a730e0a.pdf
    • https://static.usrfiles.com/ugd/96bf9d_dc4157a2bbce4419b8321a4e6fc7e004.pdf
    • https://static.usrfiles.com/ugd/3e9e83_b5b1b82d5c0545e88ee72d7f435bb03b.pdf
    • https://static.usrfiles.com/ugd/a48928_424e01aab580496e8ba5ec7768a49716.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_off0000574a.bin
51c42faed84af4a105276e20c3c95d7e0e56b7cc198fd8ceb24443ec074e1d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574A 5236 bytes
font_01_sfnt_off00006938.bin
13410bcc053c03d2f5adc98edcb59f5d54a79b06723f919e2f682635e73fd250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6938 10128 bytes

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