Malicious PDF — malware analysis report

Static analysis result for SHA-256 d121a0ae93d73a0f…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 01:22:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 07ce2b3d9b8579d9d87ea381a1f10d42 SHA-1: 5977ae4c81c7a42699f49acc4afc1b904f27f5b9 SHA-256: d121a0ae93d73a0f705ace2e66ce0181d94824267629a48fe14c11a3316180ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game items. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-on-coin-master-game-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely leveraging a client-side exploit or redirect chain to deliver a secondary payload.

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/free-spins-on-coin-master-game-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-games-with-scripts_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-survive-the-disasters_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/tiktok-free-textbooks_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-money-hack-tool-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-gte-free-robux-codes-for-pc-2021-october_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-free-download-ps3_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-script-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-for-free-stuff_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-pet-simulator-hack-script_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_002_off000031a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A5 22996 bytes
SHA-256: d0ba78bcc1b3cd0c619112c4b6de8faeb6349213add91b0931e141ff69a5c3d9
font_01_sfnt_off00006545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6545 18432 bytes
SHA-256: 4593a1a2ad250b9c338d1094e610fce2cd2b7d4b85c0b8acce75d41d0f65b4d7

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