Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdf4780b992fcca…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 21:57:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 952b9e3e4ca93f150aaa9791ccf49e1c SHA-1: 125160f045ada915f555b98369dc100999bac7a3 SHA-256: 3cdf4780b992fccae5ffd14849ffe1a1b59465bbb7fe85cdbc35136a0d8dbfa2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous links to external websites, primarily offering 'free Robux' or 'Coin Master' cheats, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs further supports a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the overall pattern suggests a lure for users seeking in-game advantages.

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/431946152/how-to-get-free-robux-on-computer-game-hack In PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/pokemon-go-free-coins-promo-code_GM1094591345.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-roblox-shirt-bot_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/este-este-unico-hack-que-te-da-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/http-appsmob-info-coin-master-hack_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
font_00_sfnt_off00002e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E66 22576 bytes
SHA-256: 0e2ac5132a7749a4a5f9cfb2ddbfacbf9c3782068cb8e763203910eda15bcac2
font_01_sfnt_off000060f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F6 19420 bytes
SHA-256: 4eeda5a53974dafe6a6a7eb0474e8c00647b290d21ead3df531c01c0ce008c20

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