Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ba58aded2e8e5c…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 05:50:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 84d7e7de54fdd9842cd02cf4fb4a1d71 SHA-1: b100e74c248638121cb0bdb9cb8142914f04be84 SHA-256: 51ba58aded2e8e5c297800bc462d4f5dbfc33f0fce01b434f2088296ab170230
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game hacks, specifically mentioning 'Roblox Fly Hack', and includes a prominent link to a redirector. This link, https://netcdn.online/app/431946152/roblox-fly-hack-game-hack, is flagged as malicious and part of a redirector infrastructure. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/roblox-fly-hack-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-its-free_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-shirt-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005204.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5204 26436 bytes
SHA-256: f48939fbd2fb0654e761e96f9540dd08a8b65d826e457f8aa4e62f249ecd3173
font_01_sfnt_off0000900e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900E 18528 bytes
SHA-256: 48aa5298b09ebe1486756ea90f1095ff6b224374f32c9ff4b9ed1390be9ca915

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