Malicious PDF — malware analysis report

Static analysis result for SHA-256 250d722bf5f5edb9…

MALICIOUS

PDF

39.0 KB Created: 2020-08-30 11:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09806ac7254e4b9f7914a0c37ed2e8e SHA-1: 7f2ee6f5a0267936b0b60ac0ed72a5f9f598baa3 SHA-256: 250d722bf5f5edb9b1f11fff2714e0ea567c53a829989fb061b95c670bde9b09
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=actiontec+gt701-wg+setup', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to router setup, suggesting a lure to trick users into clicking the malicious link. The PDF also hosts a link farm pointing to numerous other PDFs, indicating a broader campaign.

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.cc/wix?keyword=actiontec+gt701-wg+setup
    • https://static.usrfiles.com/ugd/b8c837_2980f03b62a040bf9d78b0240be816ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ccba908413f4b75b4dbe3ec35274bd2.pdf
    • https://static.usrfiles.com/ugd/0dd040_32951ee7a5dd472285f687937d5f9ab3.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f66f03741b147d385a27749e24f2d19.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_e340733d57aa411b965e826eb1f4c024.pdf
    • https://static.usrfiles.com/ugd/2c608b_cc37d3e212b64bff8c1fe38464d44e4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a9c41132ada4ed8a25eb7fa1c4e5b61.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b89e0df680240afac0dccc363cee84e.pdf
    • https://static.usrfiles.com/ugd/12f4eb_00996fd3760b4926b8dfe9021e23d756.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_off00005945.bin
5b94ebe1a858901ff7a57fa3697a78a75c6217cbd058215ae1774ac556cea077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5945 5148 bytes
font_01_sfnt_off00006b0d.bin
2edc6609666ca9a8d32f1b72607f46274902d58d02e52ce5eb72c72e89570587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0D 10696 bytes

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