Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b56f89e7e98eca8…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 20:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2194cdbf6369c043bc3bcc65e7fc6322 SHA-1: 641330ac75f7b8f5b5bac16fb8cebca9a05c99f1 SHA-256: 0b56f89e7e98eca848e0cd7c83ff25be3e6698c6430202003e0e385d82c3b4a6
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 pointing to 'https://ttraff.cc/wix?keyword=brown+bird+jamboree+joe+hardy'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to benign content but are likely used to obscure the malicious redirector. The ML classifier also 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.cc/wix?keyword=brown+bird+jamboree+joe+hardy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_cdb8c915d5d04509a775216ffb8b7c2c.pdf
    • https://static.usrfiles.com/ugd/64d889_d49095d9293c492581fb89ff4d8e6224.pdf
    • https://static.usrfiles.com/ugd/4c1554_e9fe417b0df34b77b21997dad3cfa700.pdf
    • https://static.usrfiles.com/ugd/b8c837_81fc907bc36e4398bb460a04ad9e847a.pdf
    • https://static.usrfiles.com/ugd/b8c837_483394ee66ae42fe82a0d3b3a35fe1b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a66b4b91c04d7ca7bc5b379402bddd.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_b08bab2bf4084bb6b87cc48b4dd48bfc.pdf
    • https://static.usrfiles.com/ugd/12f4eb_52ab23438eb145e8a463457d417ffe1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9a10c2122d640fa8ce4dfacc2a683ed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/formal_letter_template_australia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/16335597693.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/xaridifepajijisofexafi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0375/6196/files/wexikakunadiw.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072c2.bin
37e15674823de7fdaad91e821855d3036cc5d3d65fda8fd9ad52d1df1517de2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C2 5312 bytes
font_01_sfnt_off000084bf.bin
aa5cc6d5c17c7dd313058a68a7c947f4486cfed3f822a5ec36464ca8ffff44d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 10444 bytes