Malicious PDF — malware analysis report

Static analysis result for SHA-256 339743ee91ab7995…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 01:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90036ba71d815868980b426e81588094 SHA-1: 3898ddd4076e2065b1f7fa442a97d1ae8ec55634 SHA-256: 339743ee91ab7995c1ae475244d472ebfcee733fe2169c652cfec71cf42bb6cb
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for the 'Overlord light novel volume 11 epub'. This URL, along with numerous other PDF links pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The primary malicious IOC is the ttraff.ru 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=overlord+light+novel+volume+11+epub
    • https://static.usrfiles.com/ugd/b8c837_6e74a668484c4ae9915b94f4da3a21d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0430c70f4fc94b58b4a252bb469f3863.pdf
    • https://static.usrfiles.com/ugd/b8c837_847600236a9d42ee85982da61d0b7367.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb2ac7023035439f9a1121a609963466.pdf
    • https://static.usrfiles.com/ugd/b972d5_e06fb498ae7c4bfb9fd3f5aa4693bf64.pdf
    • https://static.usrfiles.com/ugd/a640e9_f045afba85624f5592e809a22a1a8b03.pdf
    • https://static.usrfiles.com/ugd/5360f8_08c6ec871fab48018f1615cd43e9371d.pdf
    • https://static.usrfiles.com/ugd/b7082a_8490769b184d46b6b60169a1b683f3e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3852c792e1594649940fe7e44b6a2bfe.pdf
    • https://static.usrfiles.com/ugd/d3758e_29c1f9afc5e94b9c9e603360977491b0.pdf
    • https://static.usrfiles.com/ugd/19ce5d_db1b3a118a9b459f86af30cdd5c9afff.pdf
    • https://static.usrfiles.com/ugd/87a178_5ad53d50a3294877a6721f7321fa08f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_95a2de1656cb4c7db8a4ad7c9169c6ee.pdf
    • https://static.usrfiles.com/ugd/87d215_9360105ecd664c9baa8e8035dd42aee3.pdf
    • https://static.usrfiles.com/ugd/353d00_526f03ca50a24046afd111438b4be3dc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005966.bin
def7ee8bde0a9b158d0310a1db9ebdcb1e06517a33eaced94c01f3a5b0f1089f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5966 3604 bytes
font_01_sfnt_off0000663c.bin
1520707bb9cfca46867999325501ae8de507bf4faf025bfe950a00562cfd53ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 5264 bytes
font_02_sfnt_off00007802.bin
36b641fb34e6a78977162e6200d4ee7b84aee8e3fdf621183eea036aa1b0e46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7802 10088 bytes

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