Malicious PDF — malware analysis report

Static analysis result for SHA-256 164c6ffe2febd91f…

MALICIOUS

PDF

49.1 KB Created: 2020-09-09 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151fa12f7dd627433ca04ed3df0f45b9 SHA-1: 03b937090733d12af8ac6994e1cb56af6c0e6508 SHA-256: 164c6ffe2febd91f434fc1736089acb15952fea16068638adfdd4821e0d41f99
154 Risk Score

Malware Insights

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

The PDF document contains a lure related to a 'Sweden immigration application form' and embeds multiple links. One of these links, 'https://ttraff.link/wix?keyword=sweden+immigration+application+form', is identified as a malicious redirector. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. 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.link/wix?keyword=sweden+immigration+application+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/06497e_a408b9a581e74fcb854563a6bd3411d3.pdf
    • https://static.usrfiles.com/ugd/6cabbb_874f80a2dc584afc983e6aa0817b26bb.pdf
    • https://static.usrfiles.com/ugd/e1a791_eda062fac89240a8986743a883215371.pdf
    • https://static.usrfiles.com/ugd/7e6083_d63338553780418997125bd13c6f1475.pdf
    • https://static.usrfiles.com/ugd/e6e573_3c11fc0d973a49d189ab73af70ea1977.pdf
    • https://static.usrfiles.com/ugd/65d6f7_a5e7fb36b2fd4d3594feaeadfee77004.pdf
    • https://static.usrfiles.com/ugd/57c819_2c1a27a6450b4f27b1f097e833fd5eeb.pdf
    • https://static.usrfiles.com/ugd/286fb8_5f6ffcecc6c2483fa9b3e09f93e9f10b.pdf
    • https://static.usrfiles.com/ugd/f103bb_bbb5c2119e384e8bb9e8ac3ce0c620f0.pdf
    • https://static.usrfiles.com/ugd/902d29_cb552c4ece20411c9c0e9d58655730fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d08a0134108a41e787762ba4e8b11739.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_off00006cc4.bin
b080e172a94c0cb50ebff06bd127187795f1f23c419fcdaf63dc169dd88688d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC4 5492 bytes
font_01_sfnt_off00007f70.bin
fbcdda0bd5798b5cc3217f938c3725cf8aa738aa7cac8f0ca7fc7577f97472c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F70 10052 bytes
font_02_sfnt_off0000a20b.bin
4761e3c36aff6ebd845830fc223bb7ac3274a1680e3ce0a977e62f44202c527a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA20B 16088 bytes