Malicious PDF — malware analysis report

Static analysis result for SHA-256 831af36d3f555a09…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 10:04:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0c0d4efe7f82fb095017445e124d80ca SHA-1: ed158a1a099d8d8571553e5d7cc066862209fa51 SHA-256: 831af36d3f555a09a3e017dc3744f5683ffdadec215b83e13a345dab251217bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and game hack lures, indicating a social engineering attempt to trick users into visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a download button lure further support this assessment. The primary goal appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/hackear-coin-master-game-hack In PDF document text
    • http://rainbowbuddha.academy/images/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/static-moonactive_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://rainbowbuddha.academy/images/roblox-money-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_003_off000049da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DA 25084 bytes
SHA-256: 40474bb309df69a7ebab1fe6404416e3c009e09bd6a1fa38fc6de2b3b09f6b0f
font_01_sfnt_off0000828a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828A 17716 bytes
SHA-256: b7a59136220e75e7377c9f6e3a7c38a497a32d42f46ea76588eb807573971af5

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