Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e168e4b398d6c70…

MALICIOUS

PDF

40.6 KB Created: 2021-05-19 05:15:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 386c3d718294f9bb894dee25bf7e822a SHA-1: 20ce2c5f616d67c11594c43b5bcc99af80ef53ab SHA-256: 4e168e4b398d6c709c530fcc6466a3764c099886abdf02935a2a108e0a6f2af5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirectors, specifically disguised as 'free generator / game hack' lures. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious website, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://netcdn.xyz/app/835599320/tiktok-for-free-movies-game-hack In PDF document text
    • http://cornerstonedurham.com/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/minecraft-tools_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004757.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4757 25616 bytes
SHA-256: 40dac294b72ef5d7254d7ebf5150c826aa3036cd0206169809949c137fb1daaf
font_01_sfnt_off00008228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8228 17764 bytes
SHA-256: 7afd2b678cede970b7c686f979cd734f303f3a6640854e7d13290c66bca0d35e

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