Malicious PDF — malware analysis report

Static analysis result for SHA-256 169f9be88e809c0a…

MALICIOUS

PDF

42.8 KB Created: 2020-09-01 07:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3415b3be9eb381b881caf69f5a794982 SHA-1: 58abbdb741843a1e773462fbc6421e6e191e0d69 SHA-256: 169f9be88e809c0a159982077fce5be2d31675017ba65c159975db62d6872fce
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised with a keyword related to Android development. The document also hosts a large number of external PDF links, many of which point to benign content, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports malicious intent. No scripts were extracted, but the primary malicious activity appears to be redirecting users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=android+animation+xml+files
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bae363_a5a4277ed3904ebebfdbe92980f7e6a3.pdf
    • https://static.usrfiles.com/ugd/2813e2_80ecc2016ce042a694f7ac186335e867.pdf
    • https://static.usrfiles.com/ugd/b8c837_eab64c9ed9e54033973e97e9cf7650f1.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7101/files/lamirelepiwozuximuzi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9982/3016/files/fimivawanenixobati.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2357/files/small_download_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0450/4561/2694/files/75557666893.pdf
    • https://static.usrfiles.com/ugd/83e24f_2fe702f0c8c844f489f0ff15efe29f96.pdf
    • https://static.usrfiles.com/ugd/24853a_bcbe8dd8d02d472db6e552f5ccfeb424.pdf
    • https://static.usrfiles.com/ugd/2f7815_390197f6666c494489f144c3d413872f.pdf
    • https://static.usrfiles.com/ugd/c83fdb_36811f483aec427197df84c814eef39d.pdf
    • https://static.usrfiles.com/ugd/b8c837_46a560164ed24750b3b965e884e7aac6.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_off00006af5.bin
111821ade3cce55d04115c34a1b039e34abec8f684d86f3e6283c2072fc0e07f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 5112 bytes
font_01_sfnt_off00007c4a.bin
aa7f57fdb6c7222f0aabeea4df30fbf21d96e520f84bdc591598c64c89933ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4A 10128 bytes

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