Malicious PDF — malware analysis report

Static analysis result for SHA-256 427f18aaa06e4447…

MALICIOUS

PDF

47.6 KB Created: 2021-06-11 02:58:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0098ac16b515129aca02a333067b067f SHA-1: a469f4d63f69eea147191ace5dc7cf317c46b632 SHA-256: 427f18aaa06e444754ab77cb6000c9781cb7a683249d2c8f6f9f4423ced0b8a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The embedded URL https://netcdn.tw/app/431946152/how-to-get-free-robux-secret-discovered-on-roblox-game-hack is a primary indicator of this malicious activity. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a social engineering attack designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/how-to-get-free-robux-secret-discovered-on-roblox-game-hack In PDF document text
    • http://neltalen.nl/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/free-coins_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-vehicle-simulator-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://neltalen.nl/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/fly-hack-in-eny-roblox-game-phone_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-free-op-scripts_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/robux-gratis_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://neltalen.nl/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://neltalen.nl/images/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D4 25444 bytes
SHA-256: f7df931dbb1007c9c9c5a4421158e2e26556750c010151fe3f423f3d6e27390e
font_01_sfnt_off00008ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA1 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00009558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9558 18932 bytes
SHA-256: fa7eb0c83a34357f48c474c0b45f4cc642c10fda5fbeb1504654c3b2e72bdb5a

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