Malicious PDF — malware analysis report

Static analysis result for SHA-256 145291059881c031…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 03:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 512aacff0100d763892f868373334ad1 SHA-1: cef53b3b0abc3630601001f248ad90db15194b1e SHA-256: 145291059881c0313b1814190ae072891f1110fadad8a62989924838c700dbda
194 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which points to a known malicious redirector. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document is designed to trick users into downloading a password-protected archive, likely to bypass security scanning. The presence of multiple external PDF links suggests a link farm or redirection strategy. No scripts were extracted, but the embedded URLs and the password archive lure are strong indicators of a phishing or malware distribution attempt.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ru/wix?keyword=danger+days+album+zip
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/837d34_9f5219ef80964a6aaccd33cd36115b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb3f081d440445e785ead5b9b7aed636.pdf
    • https://static.usrfiles.com/ugd/89064d_cd3e4281954a4dcba3e0d6f0457f44e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca733eb7ac848cf887eb8202189f8c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e152ae9b6e3b4857980a9bbd5936e161.pdf
    • https://static.usrfiles.com/ugd/d5415a_1ac775da176741edae1f810b6c36e1ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_50c7a0ed92414a5fb6d957d863bfd23a.pdf
    • https://static.usrfiles.com/ugd/3b47cb_fc043a2fa153485baa92c0966a04fc16.pdf
    • https://static.usrfiles.com/ugd/12f4eb_68553d3439b54ea994e8d38735a109e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a973b37b504147cd9253f887e3dad7d3.pdf
    • https://static.usrfiles.com/ugd/d775a9_6351eaaf839c4e07936e91cbdefe0e2b.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_off00007038.bin
d6c8d690be50bb6178c8a9326670045e1e382703546e6ec68b27a1731ebc6538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7038 5568 bytes
font_01_sfnt_off00008314.bin
b477283927244229ad75b25fbce41712f752bf130eda077fad4e6e47e63a4543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8314 14908 bytes

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