Malicious PDF — malware analysis report

Static analysis result for SHA-256 600ee3fb569cf464…

MALICIOUS

PDF

58.7 KB Created: 2020-08-30 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 442d9cbf98829e9cadd22859fcb8af4d SHA-1: 4b6a4da81b80ccfcef50634893f43b6fc643ab67 SHA-256: 600ee3fb569cf464c07b27c3f2d75092eb67c810ea11c3237b93192fc1593b37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=n%25C3%25ADvel+armas+nioh'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to benign content but likely serve to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest an attempt to lure the user to a malicious site.

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=n%25C3%25ADvel+armas+nioh
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c618e9_6959108ac38d443195ff2ae9af24f166.pdf
    • https://static.usrfiles.com/ugd/173616_a511aca3cca24bf8987a7c7cbab9a864.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe1d7760b8645cd8075260c6caec18d.pdf
    • https://static.usrfiles.com/ugd/e5a943_d2e10e9677cf4c90b9978f5c86266127.pdf
    • https://static.usrfiles.com/ugd/b8c837_fff4bfbdacf44f1586d74b3ede6e876b.pdf
    • https://static.usrfiles.com/ugd/5b5da7_19dac75943054936867b123d44c271cd.pdf
    • https://static.usrfiles.com/ugd/c1615c_02daeb5713094f229a88dcf58f540e8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec3edfbd5ac74a0994f2828b8d9f8f64.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af3265543474d41b4bdf191b94d007a.pdf
    • https://static.usrfiles.com/ugd/b8c837_edbf9d3e982a4cc5be79995981a2a573.pdf
    • https://static.usrfiles.com/ugd/dba42a_f8b4f1d76de5480a83d7b9c359299868.pdf
    • https://static.usrfiles.com/ugd/299074_67aa9e37bf8343b6b12a5ab982464d9f.pdf
    • https://static.usrfiles.com/ugd/078c79_3ae85512603d49a4b23842988ca2631e.pdf
    • https://static.usrfiles.com/ugd/e33828_d4735876d8c4409fade97ed063c020fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e904775cefb4412b93ad8db286da3b2.pdf
    • https://static.usrfiles.com/ugd/93c935_be24442254864bbd8249aaee43e43142.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a0f.bin
ed5aeee70e533e6584a8f865871d39b489443afe6ac9e5de01b235db91cc5d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0F 5008 bytes
font_01_sfnt_off00009af7.bin
7480e76997441a4d6745da13328d782788c4628c3b952d221ae785ff2d5d55bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF7 12628 bytes
font_02_sfnt_off0000c18d.bin
9bb10d83f7fc04780445ff594c84378026daecedb7806248e34a32adbdaf2e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 17588 bytes

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