Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ed786c74b9d609…

MALICIOUS

PDF

52.2 KB Created: 2020-08-29 05:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9311112ffc3e9fc5d9ea2288ce07244 SHA-1: 6925b55226278941e74e43099dc9c48dcca75dd9 SHA-256: f1ed786c74b9d609fa3b3f8d24791d000157dc41fe1f6cefc04bba3086ae2844
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a game guide. This link is intended to lure the user to a malicious site. The PDF also contains a large number of links to external PDFs hosted on static.usrfiles.com, suggesting a link farm for SEO manipulation or to obscure the final malicious destination. The ML classifier strongly indicated maliciousness.

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=divinity+original+sin+2+game+pressure+guide
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fa6dc405ed3443ebdf37def48f500db.pdf
    • https://static.usrfiles.com/ugd/b8c837_011cb1c16cc1455e9a0c6e68e1e63d31.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89481e684a14465a2f29f9b678df186.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8e836acaa924b13917c393c764f084a.pdf
    • https://static.usrfiles.com/ugd/b8c837_dabfd4e5ff5942e5abb8fc525bb79d5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7ec213a98f14c28b4fa32fa1541f7a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69721c1e91e4e1899830ade4b079143.pdf
    • https://static.usrfiles.com/ugd/b8c837_04290c45a9dc44848b03c1ae7cd7f477.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa954cd0d0a44fdea6c15a209b47e8b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f693ccbc5d6437c9ed79c805889af93.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a52eb78221f4fe49f00f493dab48e00.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7a8f57579a54e8bb5522ce5f8d24548.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9bc30d8345c4a9bab3030cf77febca1.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd5486c1a5304d9491eac897d1ca0c6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c723ba9a3f5462caa9481fd5195fafa.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b0f315ce69400b92392478d17f8673.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/
    • https://static.usrfiles.com/ugd/b8c837_9f693ccbc5d6437c9ed79c805

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ebb.bin
dbe994cd738c0bb0a3e899668c83f32e42daca6697452018c6b76f1524e995b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBB 5572 bytes
font_01_sfnt_off0000a1a0.bin
90ef07037063d34763dfc984a29e676d830e855d166ce5dd6a73be663c36ae05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A0 9852 bytes

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