Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9f401bd94c4f47…

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 23:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d80a5b8169826419bd1be5c9f432c0 SHA-1: 5886dcde2577a5e8a8b53a0d49f6be992beddf69 SHA-256: 4c9f401bd94c4f47044dd611cdefe6715491072d95bc480a3aa0a51fcaf2eacf
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector link to 'https://ttraff.ru/wix?keyword=bejeweled+1+game+free'. The document body, though heavily obfuscated, contains text related to 'Bejeweled 1 game free', suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=bejeweled+1+game+free
    • https://static.usrfiles.com/ugd/defcb2_ec369ce2e4b6489fa88c49f864f95441.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_d2906b370dba4e47ba3b1db5a05a4faf.pdf
    • https://static.usrfiles.com/ugd/b8c837_d58e55c4da084915a04127f1b72669aa.pdf
    • https://static.usrfiles.com/ugd/58a813_92287b455b444433aa061fea99a3775e.pdf
    • https://static.usrfiles.com/ugd/fedf23_edc4f437edc64e489a31387600f2fe26.pdf
    • https://static.usrfiles.com/ugd/9dda13_5008d622e4da43bb80dd73649d09b837.pdf
    • https://static.usrfiles.com/ugd/158fb9_896167ee137442e1be111b7ce824a06e.pdf
    • https://static.usrfiles.com/ugd/07e02c_3d5d01502d10409992009d661110e2a2.pdf
    • https://static.usrfiles.com/ugd/e5412a_a7d2083ae6624b53b1d5646f00a0e15c.pdf
    • https://static.usrfiles.com/ugd/b8c837_83065d9ecf9b4092bf1dee369d265a87.pdf
    • https://static.usrfiles.com/ugd/34ec99_9cedddaa4354419d8a3932f2173cd268.pdf
    • https://static.usrfiles.com/ugd/73cb9e_4aba15a519e548f99f59e8aae49a65fa.pdf
    • https://static.usrfiles.com/ugd/ea78e0_19192e329542451283fa9780c1851e0e.pdf
    • https://static.usrfiles.com/ugd/4d400c_82d538f8c171495bb09aa8d7ec6a3e60.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4d71394db514285b0e877aaeb746780.pdf
    • https://static.usrfiles.com/ugd/576447_6b2f9db23b5b4ac6a6c56afa3ecf9f77.pdf
    • https://static.usrfiles.com/ugd/09273f_081e0894fb3a4909a8eb21985383da02.pdf
    • https://static.usrfiles.com/ugd/b8c837_4425d740eecb4d4791d468f983017618.pdf
    • https://static.usrfiles.com/ugd/bd5c68_a985d47c3d3348148dceca0e7c77e5da.pdf
    • https://static.usrfiles.com/ugd/0049ca_1a921f73f08b403cb0dcf431b0badff1.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_off00007845.bin
56b9e33e67a2ec75eb17540c96c833ae04b225b340e42d9f97114f62d2f155de
pdf-font-stream PDF embedded font (sfnt) at offset 0x7845 5320 bytes
font_01_sfnt_off00008a64.bin
2d1c3869190ca8d10892b59916df09b139da0b0bd3182fcdd799af818ee26dd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A64 10532 bytes