Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d4f904d19ece38…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 23:56:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b78cdb1c560985d15fcb510b2815c276 SHA-1: 4b3e8ecbf4a00d8461bd9dfce5051032526687da SHA-256: 12d4f904d19ece38793c6fc2c089aa04555f051f82001b150217ea74e14a4ae7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and document body text that mimic game-related content, specifically 'Minecraft Realms' and 'Roblox', with a clear call-to-action to download. The primary URL, http://netcdn.tw/app/479516143/is-minecraft-realms-free-game-hack, is directly associated with the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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 http://netcdn.tw/app/479516143/is-minecraft-realms-free-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/free-download-noclip-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/more-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hacked-roblox-3d-shirt-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-hair-roblox-not-moel_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/rbx-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-robux-hack-free-download-no-survey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-robux-2021-not-patched-mac_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-chrome-extention_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-cheat-dll-2021_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
font_00_sfnt_off000031c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C2 21732 bytes
SHA-256: 210480845baa8a7d30ffb9b9790cdeb6e7ece62b47972b71e5d949f8a57fec2e
font_01_sfnt_off00006165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6165 18192 bytes
SHA-256: 3fdf6c7900c76153a6c8ba7010afe065a028b37808fae2d556e2bfe86359ad32

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