Malicious PDF — malware analysis report

Static analysis result for SHA-256 a642f3055e173d6d…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 04:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 792a0e3c83a38676f7d5a59553cac74c SHA-1: bdb809bcaf3f1308e7bdd095c7f1c2899f938c70 SHA-256: a642f3055e173d6d1a21db259ad7689c0bd5b37e509ab9e724c97656141626ed
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=english+file+3rd+edition+pre-intermediate+workbook'. This indicates the document's primary purpose is to redirect users to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous links to external PDFs, with the primary host being 'static.usrfiles.com'. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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.com/wix?keyword=english+file+3rd+edition+pre-intermediate+workbook
    • https://static.usrfiles.com/ugd/c7a620_0ad481c5a433439a9f6b1dd5d9d987af.pdf
    • https://static.usrfiles.com/ugd/26481d_6a36e056ae91498db196fd3dc6eee762.pdf
    • https://static.usrfiles.com/ugd/36f25b_8685f6099a9c425c97c275d513e68622.pdf
    • https://static.usrfiles.com/ugd/822ecd_75c58599e8144983b69597f6afa537a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a132efa975a4f72b20008bd854b21ce.pdf
    • https://static.usrfiles.com/ugd/234f58_3e370605dec54c2ba2b3c53781f7d1fb.pdf
    • https://static.usrfiles.com/ugd/de3d83_0d66eb9b52514166bb184412fb2512c5.pdf
    • https://static.usrfiles.com/ugd/affaa6_b0048fa35a0b4cdcb97bba9bcbea19ee.pdf
    • https://static.usrfiles.com/ugd/a44510_28bb63b1e3964372be4f2e6ddf978048.pdf
    • https://static.usrfiles.com/ugd/906e9f_37ba72660f8d44569efbaec55af58fd9.pdf
    • https://static.usrfiles.com/ugd/83e24f_ee0e1b10a57d4a5baa0334db06070874.pdf
    • https://static.usrfiles.com/ugd/b8c837_71ee7a45dfad423e9b5932f2d52fef28.pdf
    • https://static.usrfiles.com/ugd/63022f_089ba1315a4d423986327c4f230bd353.pdf
    • https://static.usrfiles.com/ugd/b8c837_d25bd7c384f64513b634e0770dba64ed.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_off00005d71.bin
a62bdbabcd94bf4a5349f41463af8add6ac0b1a6d6eddb8feb1f6785db6c4623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D71 5904 bytes
font_01_sfnt_off00007179.bin
74592a3c3d75ed74e49f32d44dc96a93b7ae89aac9dd465c574ccecd3d406d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7179 16436 bytes

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