Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dbdaf6763472a4…

MALICIOUS

PDF

37.9 KB Created: 2020-08-30 18:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d44b0fa9c29083237686da5e4a1a8e7 SHA-1: a399c26a8b081d4a525f2612ee7fb0fa09caab33 SHA-256: f3dbdaf6763472a4126dc024740a8040eca14d83bb36062dd30ee578f98c15d5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through these links, with 'ttraff.cc' being the most suspicious IOC.

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=steven+lust+automotive+aberdeen+sd
    • https://static.usrfiles.com/ugd/b8c837_c20eb92b6cb9488897b5fdd42d1e0f5c.pdf
    • https://static.usrfiles.com/ugd/c8a981_cac0b4aa7b714931ba34db348e30cb27.pdf
    • https://static.usrfiles.com/ugd/b8c837_74b37849e3e245b4a22c5a00b4066290.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/edit_scanned_documents_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/95848145819.pdf
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/solving_quadratic_equations_worksheet_4_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/63064057931.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/laweziz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/gebum.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb6451e830434a869b0256e0a060551a.pdf
    • https://static.usrfiles.com/ugd/b8c837_92636154c2234b04bc6406555cb7d128.pdf
    • https://static.usrfiles.com/ugd/07e02c_0ce1da424fd841f081730e2dc697fc26.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004988.bin
c8e1ddce450c761fe629ba5d0b02205c87849646d1d1a43c39e277cdbc0acfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4988 5156 bytes
font_01_sfnt_off00005aeb.bin
e773b4f6219c99e1b649a2c49589088dbcc69eb2d5adf7ef33576cb0012cc17f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEB 9964 bytes
font_02_sfnt_off00007cf6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF6 4324 bytes