Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f4923dd7ac0aca…

MALICIOUS

PDF

72.5 KB Created: 2021-01-06 16:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f247a1d46fb9156c767034756dd4fb27 SHA-1: c78e4707bcd85ef66793840d9b44179fc5c09b86 SHA-256: 62f4923dd7ac0aca3c997798e0ce6fd4f60026ac142c60de9248d5cf080afedf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://gettraff.ru/123?utm_term=castle+clash+mod+apk+ios'. The document body, though heavily obfuscated, contains text related to 'castle clash mod apk ios', suggesting a lure for users interested in such content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=castle+clash+mod+apk+ios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fb2a42bd5677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fa1ce12c861f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fee7668c5f85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fdfc51bbabaf.pdfIn PDF document text
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/7647994.pdfIn PDF document text
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/7710220.pdfIn PDF document text
    • https://fixaninupokawaw.weebly.com/uploads/1/3/0/8/130873986/gazuterevimat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5fc97779456e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acbb8fb-ca49-4c7c-bdf2-fb105de141a8/elite_dangerous_interstellar_factors.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/westinghouse_high_school_mascot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd708309-5d4a-41d9-8807-a337cba87b5e/shadowrun_rigger_contacts.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/juvixetapefakixelatem.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/register_broadcast_receiver_in_android_manifest.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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 5188 bytes
SHA-256: 31401a97820240802f10ba2ec155efe402ed63e1daa32b656655f7eeaeee05bc
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10972 bytes
SHA-256: 4e3aa5653a722030652017d72a39d47e772c705b3b6d898886e7fbbab3e086eb

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