Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66ffdb83980d1b8…

MALICIOUS

PDF

69.7 KB Created: 2021-01-14 15:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 10daab0d0424151ca4301fc034216f75 SHA-1: 9e4fa1e2a937ef327377e787182c2dc538eaaadb SHA-256: b66ffdb83980d1b8e8a5e158fed66ac016d7fcf81db49363a4ae0519fd019b1a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=the+disappearance+of+childhood+postman'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=the+disappearance+of+childhood+postman In PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/8040927.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/jgiid3u/mutants_genetic_gladiators_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f93c29630164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382194/normal_5fc79e0c2ac56.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/ZQIgen0/27977714996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fdc4746247d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fcde09297355.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/wwgiLjf/jepubamanudimev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/removed_device_from_secret_conversation.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 5344 bytes
SHA-256: 6073c70fdd3dab6cb87c7fa772d8ac10b8fa7f102f2f0dcc79fd713fd6e7eca5
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 10784 bytes
SHA-256: b7880ac7e40d8f9361e5442cc5fe4c94a01c9d64b46794d2874fed0617232013