Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd33439c86fa5bd…

MALICIOUS

PDF

35.9 KB Created: 2021-07-04 20:29:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 19930c102730da5b141a2adb584a65c9 SHA-1: b4bf60a71ee455da23e4fdf3bbfc7addf607373d SHA-256: 8fd33439c86fa5bd9653201e5993dd7c954a95c8537e4f58c04421fbc83c13a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure, advertising free game generators and hacks to entice users. It contains multiple links, including a primary redirector at http://netcdn.tw/app/406889139/coin-master-free-spins-2021-app-game-hack, which is flagged as malicious infrastructure. The document body and embedded URLs suggest a phishing attempt related to popular games like Coin Master and Roblox. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or scam campaign.

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/406889139/coin-master-free-spins-2021-app-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-roblox-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/cheat-engine-roblox-tycoon-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-builders-club_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/unknown-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-builders-club-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hwo-to-create-a-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-boku-no-roblox-remastered-hack-script_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-cheat-codes-for-hoes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coins-coin-master-haktuts_GM406889139.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_002_off0000346b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x346B 23192 bytes
SHA-256: d1468d4a5c7d946b0a1b3e59ffbdaa119abef0b670ec3783e75bbbacdf44120f
font_01_sfnt_off000068d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 18576 bytes
SHA-256: c48ecddc58cc9103ab91fca050c766b90a1071ce7271be5da557b4f3cbe5bb61

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