Malicious PDF — malware analysis report

Static analysis result for SHA-256 b880c6d3eeb1522d…

MALICIOUS

PDF

36.3 KB Created: 2020-08-30 02:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be63d44f8d184c536e2fb626485d1e25 SHA-1: b683099e7525138ad51da19eb32624a4d762cb74 SHA-256: b880c6d3eeb1522d6462bccac3e39a106791cade753ca26832e1483ce482512d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.ru/wix?keyword=magic+tree+house+dinosaurs+before+dark'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify and static.usrfiles.com domains. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be mostly garbage data with some embedded URLs, suggesting it is not intended for human consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=magic+tree+house+dinosaurs+before+dark
    • https://cdn.shopify.com/s/files/1/0452/2138/0247/files/central_consumer_protection_council.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/stock_market_basics_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0447/1206/7228/files/25364952408.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/948740237.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/gross_anatomy_of_lower_limb.pdf
    • https://static.usrfiles.com/ugd/e4ff69_de936ca453634ccba9ad9a82b1bade32.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_91e7ac8e8c45482a903b2b802c958c76.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7453fe166aa421cb9a6576793c7d090.pdf
    • https://static.usrfiles.com/ugd/12745a_dd4aaa656fbc49c2b75d2a0c28daa151.pdf
    • https://static.usrfiles.com/ugd/b8c837_39f7dbe0cd854a7083df6d2543a5a8f0.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_ce6985d5259c472f95aaaee63e08619c.pdf
    • https://static.usrfiles.com/ugd/9219f8_35f84e3bbfff42c29a37886b20b395f5.pdf
    • https://static.usrfiles.com/ugd/b7ed05_9e3f5fb372644b899a85220584bde133.pdf
    • https://static.usrfiles.com/ugd/8cbfce_84313d6c10604158b15ff691a360134d.pdf
    • https://static.usrfiles.com/ugd/26481d_27804fbddbf643af9943d7a04361a946.pdf
    • https://static.usrfiles.com/ugd/516793_9d8b2a8799bb4ea99a41135c54660631.pdf
    • https://static.usrfiles.com/ugd/b8c837_9badf7fb0ffd40e79498412c81767ac0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6477cf545f694567a7980cc4a6bc81e6.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_off00004fa4.bin
ce0dc581f84c746770e1cc00dac8a41ee7fbc86fc178a9d12d214eac95ee5510
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA4 5460 bytes
font_01_sfnt_off00006234.bin
6953fe1e21335d49ee418c64ba199f79e00f08bbb29bbea5fdb14d1b4ce9e5f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 9864 bytes