Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50a9661304f5d7a…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 15:38:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 08a79750eb1a489ad62011bb5b9ab09b SHA-1: c8c6a64c24493b55a72aec4b30ded1edfc0e0428 SHA-256: c50a9661304f5d7a86cc922bdb5ea40f7cf37eebea94e1dda0b5b4f58f016ade
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, designed to lure users into downloading game hacks or obtaining free in-game currency. The primary malicious link, http://netcdn.tw/app/406889139/hack-coin-master-game-download-game-hack, is associated with known malicious infrastructure. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful sites.

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/hack-coin-master-game-download-game-hack In PDF document text
    • http://ggmtc.net/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/cool-avatars-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-bloxburg-hack_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_off00002d60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D60 23596 bytes
SHA-256: 060cd95c1c551d76519ae0b299f0a5029cd2ed04224df4c93d1f82357035dc83
font_01_sfnt_off000062b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 18844 bytes
SHA-256: 86150aa1046335345da6ccccfb8bf228f72aa9e374df20a0ecac564e602a908d

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