Malicious PDF — malware analysis report

Static analysis result for SHA-256 431c1a819c021c2d…

MALICIOUS

PDF

62.8 KB Created: 2020-10-11 03:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbd0deb0a3bcf7be781db3c07f65555c SHA-1: e6947011f316977c736962e570898084d2f1edb4 SHA-256: 431c1a819c021c2d4801a5552400e68fd11fae58c6e6418b6ed8011325ca3a5a
124 Risk Score

Malware Insights

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

This PDF file contains embedded URLs that lead to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=1986+sea+ray+seville+owners+manual`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking it. The presence of numerous links to disposable hosting further indicates a link farm designed for malicious redirection.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=1986+sea+ray+seville+owners+manual In PDF document text
    • https://site-1042674.mozfiles.com/files/1042674/6612207598.pdfIn PDF document text
    • https://site-1039573.mozfiles.com/files/1039573/kover.pdfIn PDF document text
    • https://site-1037854.mozfiles.com/files/1037854/lenigifemezud.pdfIn PDF document text
    • https://site-1040327.mozfiles.com/files/1040327/86987649348.pdfIn PDF document text
    • https://site-1036667.mozfiles.com/files/1036667/37713406503.pdfIn PDF document text
    • http://dokevi.uccbaycity.org/uploads/1/3/1/3/131378898/a95211a0b17e6e2.pdfIn PDF document text
    • http://tijube.clevelandvoiceandsleep.com/uploads/1/3/0/7/130776299/5058970.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/4693941744.pdfIn PDF document text
    • https://site-1038604.mozfiles.com/files/1038604/bodakekabox.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/fezudulasebasosadotubigiz.pdfIn PDF document text
    • https://site-1039570.mozfiles.com/files/1039570/dajabewutabatu.pdfIn PDF document text
    • https://site-1039815.mozfiles.com/files/1039815/86331203869.pdfIn PDF document text
    • https://site-1038309.mozfiles.com/files/1038309/99935585647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F33 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off0000a92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA92E 5348 bytes
SHA-256: 37b20d94369812053bfb2bf284a04d3d310f83d51c754e66096fafe17fdb392b
font_02_sfnt_off0000bb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB41 10952 bytes
SHA-256: ab20fb6eb5b4dc1e50c6eac93f5de85307f822ab114b4d7b75f837de193b0d14
font_03_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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