Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d644065490eaf4…

MALICIOUS

PDF

81.8 KB Created: 2020-08-30 15:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efeb6b618d02d517283868b10ec9d54d SHA-1: d90d39cc1582af7b9190dae3b18b30827688c3bd SHA-256: 74d644065490eaf4a03fd107cb0685ae3f0ce5915690f88cf4d118ff224f079c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=%25C3%25A7e%25C3%25A7enistan+tarihi+pdf'. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL.

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=%25C3%25A7e%25C3%25A7enistan+tarihi+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/95089d_cc61ee63de514757b6ff76047d61edf7.pdf
    • https://static.usrfiles.com/ugd/99a8f2_07a5709d88ce42d3baec3f9c4a5fa9f6.pdf
    • https://static.usrfiles.com/ugd/c836c3_b652c41a51dd4afc9a25a9e789bdf897.pdf
    • https://static.usrfiles.com/ugd/b8c837_3849cf880a9d411e869eb4303ccdca74.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbd7408486747099e70b2d12ebee26c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb9c164d9f764af6adca72799d9bd272.pdf
    • https://static.usrfiles.com/ugd/69b86f_934996356eb34d0d9946f85e8c5fdbe4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3279adcd308141108f647b98d0b30610.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.pdf
    • https://static.usrfiles.com/ugd/314c35_d3cde7ed27c640428a13ec8ea6343bad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/old_firefox_for_mac_10._5._8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d893.bin
245739f58f3f791c4bef22d0fd486f2ee50bcf3a34764a59352e0948cfe82227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 5048 bytes
font_01_sfnt_off0000e97b.bin
85079e14f6e53cc7f8ab2d857b029d4400fa0c9dd55f0e3c5304d475828a5675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 11824 bytes
font_02_sfnt_off00010da3.bin
42d120b2f6a45f603790b86c4a633fbb422e0409416a10c09c84bf51a6e735d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 18316 bytes
font_03_sfnt_off00012a2c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 4324 bytes

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