Malicious PDF — malware analysis report

Static analysis result for SHA-256 a512928dc7d2e4a3…

MALICIOUS

PDF

33.7 KB Created: 2021-06-19 02:30:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 900cae7ab8bf2b4f264c677ce584d314 SHA-1: aa15aec45cd8f883ed98c17a2c2200358db2995c SHA-256: a512928dc7d2e4a3a0ad65de6798dede86924de2ca3f6761464b8e84644f71cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites offering free game-related content, such as Roblox hacks and Coin Master spins. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's designed as a lure for game hacks. The document body and embedded URLs confirm the intent to redirect users to 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.co/app/431946152/can-you-hack-your-own-roblox-game-hack In PDF document text
    • http://kalaydova.com/images/robux-gift-card-codes-free_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-free-adverts_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://kalaydova.com/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://kalaydova.com/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-hack-sharder_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/free-robux-codes-apk_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/getrobux-info_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://kalaydova.com/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://kalaydova.com/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://kalaydova.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://kalaydova.com/images/promo-codes-to-get-free-robux_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_off00002d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D50 22368 bytes
SHA-256: 87f702911d5f6b24b87539f3737652c5ba3c3cc583642b6a1d48228331605156
font_01_sfnt_off00005edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 18936 bytes
SHA-256: a637ba1653098ec2a7c98e5b90efcb3d122fb873a6f079f937c47d15f2779c13

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