Malicious PDF — malware analysis report

Static analysis result for SHA-256 735101c4b252ac30…

MALICIOUS

PDF

38.3 KB Created: 2020-08-31 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169420d20d5090cc7ab94d4c41a379be SHA-1: ffd877cad80ea78d4cdfb9279d2358e338f5b40b SHA-256: 735101c4b252ac309da50587259d846553d099469e830df09c32bd6557e9c904
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wix?keyword=james+ward+brown+and+ruel+v.+churchill+complex+variables+and+applications, is flagged as a malicious redirector. The sample also exhibits characteristics of a PDF link farm, with numerous external PDF links. The ML classifier strongly indicates maliciousness, supporting the conclusion that this document is designed to lure users to malicious infrastructure.

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=james+ward+brown+and+ruel+v.+churchill+complex+variables+and+applications
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_c9540df9056c4ca2ac0d3107eba11de8.pdf
    • https://static.usrfiles.com/ugd/eaf48f_3723e28eeaac436681a9d7a11a3e2a27.pdf
    • https://static.usrfiles.com/ugd/b8c837_7126a32b991b40a094026de72dcea7e8.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_7014ea0bab92488591c8b94978597373.pdf
    • https://static.usrfiles.com/ugd/913720_f16f74b8c0fe44b5928df3f1e0064f55.pdf
    • https://static.usrfiles.com/ugd/99a8f2_7c8fa1fdf6f743bf8a8b1f264df36187.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6605/files/davali.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/siwuwomenesuzikumabo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/34122738136.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/transistor_amplifier_circuit_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1433/files/calculus_2_final_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/motorola_surfboard_sb6120_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/darkest_dungeon_guide_provision.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/91898020955.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c2.bin
e6fa141496f295a9779cab8532439306009b8747a66f84d6b7ad8b774d184743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C2 5576 bytes
font_01_sfnt_off00005b94.bin
b3bebec695ffac63ef3e77e268b9e224095acce60611f9b9b0d28c3cb7c9d86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 9948 bytes
font_02_sfnt_off00007da6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA6 4324 bytes

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