Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f5c978d3edf7c9…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 09:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c03b1c3faa467d82f951af9a35c43e3 SHA-1: c9c336b6a4369d61e0a6e0c30c68a8943fadca26 SHA-256: 72f5c978d3edf7c972b0338fbe41f37ea4c49eba94b8129774f1954ded360b61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm or SEO spam campaign. The primary malicious URL identified is ttraff.ru, which is flagged as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=lockheed+f+19+stealth+fighter
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/04e6f9_b9f739ad063b42f0bf3f03aacbc41591.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d310fa013448ffb91548e2e9a5dae6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb15d351860a42d19f832bd1fd6d34d4.pdf
    • https://static.usrfiles.com/ugd/a4d998_1db5a8a4a4ef4c52bfd62e351e09f619.pdf
    • https://static.usrfiles.com/ugd/d5415a_7b317215a69e463e8b2c8d4b80e5601d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f5cb8898cb2475daaf71e0dc8e3a51c.pdf
    • https://static.usrfiles.com/ugd/d162e3_b8bd04edf459429e9e6a22aa522554a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e364d45b16e04f329ad911d09b74ddfa.pdf
    • https://static.usrfiles.com/ugd/8ab72e_32e765e967e440b791358d2b89a8070f.pdf
    • https://static.usrfiles.com/ugd/5e8de6_db7e778a966e4389926dcfa1ec743d9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdba102466e944d28201341681839255.pdf
    • https://static.usrfiles.com/ugd/930050_155ac11eeb644b5fb74d47e525a0249e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c348125c14e743af95484c08f42a5667.pdf
    • https://static.usrfiles.com/ugd/735189_ac78f1711ed84e829d0fdcd7957ff4fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_870e0e68e57640e58ff529effbee9e36.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe136bcdc9e448dbf4c3a112f7ebd87.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc17681cc45544259d04b49a771b5b28.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dcc.bin
85dde5a0f79d5ae84f6f8c0e890184a3cfbc7d46afe22a4dd11b7492d2b6aa3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 5496 bytes
font_01_sfnt_off00008076.bin
c196729f75a64e48303586796b14234e11f47041e6de672da2f7b5b6e7996c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8076 12012 bytes

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