Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb738dd16687aa12…

MALICIOUS

PDF

46.2 KB Created: 2020-09-09 06:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012150fced79f3d8709b460abdc2f2f2 SHA-1: 3f2bfb981e8dc1fc25222d86e2aa5be8f0b0a0e9 SHA-256: fb738dd16687aa127d2e3e86c646778685ad97407499f07b8e3918bd4acbddc7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of numerous links suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, and the primary malicious activity appears to be the redirection to a known malicious URL.

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=what+you+mean+to+me+sheet+music
    • https://static.usrfiles.com/ugd/ac8c68_b268439df7be45628c90bb1b93f3cc95.pdf
    • https://static.usrfiles.com/ugd/c0518c_dfcbef12c4c3409daeab8f386a7cf2c1.pdf
    • https://static.usrfiles.com/ugd/76156b_687f7f8ff89842e38ec44a4c5713b504.pdf
    • https://static.usrfiles.com/ugd/6cabbb_dcf3123929d14d56b9291eb3909ed519.pdf
    • https://static.usrfiles.com/ugd/8b97dd_675d9c37b16840e3b128239909743cc5.pdf
    • https://static.usrfiles.com/ugd/c0b427_f3f35d47767e45d492aa208106548a64.pdf
    • https://static.usrfiles.com/ugd/0df15e_403876daf5dd4b999758401c95ad22b4.pdf
    • https://static.usrfiles.com/ugd/a2d007_ea0161c9c7a64685b70039ea5ae03341.pdf
    • https://static.usrfiles.com/ugd/96564c_cf9d0efb49fe44d8903849968f6622f8.pdf
    • https://static.usrfiles.com/ugd/fef806_b30ff90c88b847d48850fd57cc7425cc.pdf
    • https://static.usrfiles.com/ugd/bf650e_19f8a17aaf5444649481a2dbb850d3a5.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_ffd0e873ab7941268253da8b3e9b86c1.pdf
    • https://static.usrfiles.com/ugd/a4ea6c_b34f47c3492a4a94b74fd34d79798d80.pdf
    • https://static.usrfiles.com/ugd/06497e_0cd98809c74e4bbda985c431f21897a1.pdf
    • https://static.usrfiles.com/ugd/3835dd_3840d752147d4b86bc3a8faccbb0c300.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_off000075b8.bin
0fe8ac6496fc6dc17884da42d5523304852d0abc16b0276225c2613171fd540c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B8 5028 bytes
font_01_sfnt_off000086c1.bin
eb0b3731fad59bcf2712f3ac68bc6d7c4118cb1ef5fbef0161fa24f7bdeeb219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C1 10456 bytes

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