Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21406bebd8b55d5…

MALICIOUS

PDF

45.9 KB Created: 2021-05-15 16:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 368cf371b8d3a3699df3a4e958ad3328 SHA-1: ed80870051405e9e31082c542448180c1ef0e28e SHA-256: b21406bebd8b55d5a2f53835938275e0850e38ac0a76e2a8c680a2b8418c1c01
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and scam-related content, specifically targeting users interested in game hacks and generators for Robux and Minecraft. The embedded URL `https://netcdn.xyz/app/431946152/robux-hack-generator-game-hack` is directly associated with a lure for free Robux. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely intended to lead users to phishing or potentially malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/431946152/robux-hack-generator-game-hack In PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/robux_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-minecraft-mods_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A26 25928 bytes
SHA-256: 1043af6218a58c3a98a5ed0a4597b34cde18d15cc3601db082610c0af33609fd
font_01_sfnt_off00008649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8649 2916 bytes
SHA-256: 3aa718082923f655e5c89c0836700a3643843eab23ce8ed8f4751784957ddbee
font_02_sfnt_off00009053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9053 18352 bytes
SHA-256: f5433ce3dc9930d213a8e7315569ee207b9df6dd56817c97a1fb358bc14a6a3b

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