Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e33f8df1b8b888a…

MALICIOUS

PDF

36.2 KB Created: 2020-09-03 11:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb66e61e13984a693ba1ae93c99e9833 SHA-1: b66bf40579ddfc1cd7439c53d7bb9e9dc679e20d SHA-256: 5e33f8df1b8b888aeb4ae935da1e575d4f7c329df2cddefdb519cc812f216fa1
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=blog+post+outline+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files, suggesting a link farm or SEO spamming tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.link/wix?keyword=blog+post+outline+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_62eeeef4f66b4920838a566ffebee976.pdf
    • https://static.usrfiles.com/ugd/271e65_fb122c4fb9f74f898d308137461e5668.pdf
    • https://static.usrfiles.com/ugd/15ebe2_1d0a36a10ac74e4d9e325d0afcfd95fb.pdf
    • https://cdn.shopify.com/s/files/1/0465/3236/2390/files/60578106171.pdf
    • https://cdn.shopify.com/s/files/1/0434/4083/2678/files/56712034678.pdf
    • https://static.usrfiles.com/ugd/28b3f7_83aa06725545451eb8cdc1f18b65a12c.pdf
    • https://static.usrfiles.com/ugd/3fb742_bb019aa9f08043398e1aecd6d7bc0b21.pdf
    • https://static.usrfiles.com/ugd/d1c05f_055fe471f62f4ab8a982f239ab49a04f.pdf
    • https://static.usrfiles.com/ugd/bd5c68_b16be74f7d3e4b3991a1efe08ba6d0fe.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_off000052a1.bin
b406ada1adcebcb78d85cf5ea9c0c849ad6f7dd4ee9d1551fced81cf9417f1ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A1 4952 bytes
font_01_sfnt_off0000639c.bin
851f69b55b4096486d3ae14daaa65fa253f70ec9417803ae444e1baeeac43f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 9760 bytes

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