Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d0da686e5c5607…

MALICIOUS

PDF

45.1 KB Created: 2021-05-17 09:42:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0aed1a493635a62d265d3b8ae5b3abf5 SHA-1: c8e936251ca1a5c506d9855435eefc8b2c8e934f SHA-256: b4d0da686e5c560745bd368fabf271705dd813771f196601ec726711b024fc07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and other potentially malicious PDF files, disguised as "free generator" or "free spins" lures. The primary malicious link identified is https://netcdn.xyz/app/406889139/free-400-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/406889139/free-400-spins-coin-master-game-hack In PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-no-verification-at-all_GM431946152.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_off00004d88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D88 30240 bytes
SHA-256: d4561202230123c023e561b05c56850415659e724e36b7255c400d6b796923b4
font_01_sfnt_off00008e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E80 18120 bytes
SHA-256: 83d73b5d15900ebf4c8e8e4c37772eeea58eeced4667d8a4ec0d9f93b93c7b15

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