Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a25794e85df422a…

MALICIOUS

PDF

47.1 KB Created: 2020-09-02 01:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25226d1fdd283d764374cda578089e3f SHA-1: 4d5f3f40280a59669b80ce8349ff9722db4e3c6b SHA-256: 9a25794e85df422ad05670ade1813d9183c411fddfa2b5a702a0a2b16384c261
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=great+is+thy+faithfulness+clarinet+sheet+music'. The document body, though heavily obfuscated, appears to contain text related to sheet music, suggesting a lure. The presence of numerous other PDF links, many hosted on static.usrfiles.com, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=great+is+thy+faithfulness+clarinet+sheet+music
    • https://static.usrfiles.com/ugd/dd4472_b02dbae6a1224e75a821b04d0a8aafa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_db13691e58fc4a4fb4efa410dd18d310.pdf
    • https://static.usrfiles.com/ugd/fd30ac_ebdb144cda6e4261b9fbfe2612f699d1.pdf
    • https://static.usrfiles.com/ugd/ace02d_9f682462d99644a8b70b7385edf4efe8.pdf
    • https://static.usrfiles.com/ugd/eed56f_6c3fa3e359c443868b1ea8e8e25f9045.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/84324191825.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/takomitun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/sabutopevotewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5291/6119/files/keramiwakiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/8680/5147/files/gunotasototo.pdf
    • https://static.usrfiles.com/ugd/76b6de_12d4661cebef492caab193c5405ccc31.pdf
    • https://static.usrfiles.com/ugd/08fe48_94064dbf2eb541bea7e7a873d61fa116.pdf
    • https://static.usrfiles.com/ugd/205ae4_aa120d53a2794b49a4f8c25b59ec7727.pdf
    • https://static.usrfiles.com/ugd/6203b9_2d500a331b804270ae6c2554bf3f43fc.pdf
    • https://static.usrfiles.com/ugd/dd6616_21e63f0e29844428bbe3369dcc8d654d.pdf
    • https://static.usrfiles.com/ugd/0511f5_e04b19d182584388873a75e231be8e0e.pdf
    • https://static.usrfiles.com/ugd/7baf93_e33a7698a5c04be7b5bec273a4e52261.pdf
    • https://static.usrfiles.com/ugd/913720_33bb36484ce74c0d89fb6cc1563182d3.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_off0000727e.bin
51cdf5c34e05dfdc265cacc3920e53135f429d349afa56e38e12456da4b48fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727E 5252 bytes
font_01_sfnt_off0000843d.bin
593ba3bf0328e5b0640f8dd1a215aed7b0d75a262fc0768d4aa9d889a0a44af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843D 13916 bytes

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