Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e509087c99b562…

MALICIOUS

PDF

35.2 KB Created: 2021-06-27 07:10:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 99751eefbe99f179b6158834d82f9ade SHA-1: caa2253b5f981fee423ed66c278d4f9f1bdb5e91 SHA-256: 31e509087c99b56271f051def3e6c6ae7d8585bc84091816321f9f771558afa8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one that directly offers a 'Roblox Robux Hack'. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The presence of numerous URLs related to game hacks and cheats suggests a social engineering attempt to trick users into downloading malware or visiting malicious 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/download-roblox-robux-hack-free-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-r-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-com-free-skin_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-tiktok-free-likes_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-verify-or-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-clothe-goku-free-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/easy-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-vermillion_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/medikit-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-how-to-be-copletely-white-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-app_GM406889139.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
font_00_sfnt_off00003223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3223 22156 bytes
SHA-256: 49e2a825337bfd74ca0a2e7ba9e573871cb5cbc1f53a13a0f8c411e3189fac1f
font_01_sfnt_off00006364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 19464 bytes
SHA-256: caf4652f4d4e954cb9905b408f7232ab716c7ded2966c6d534a4fa7a312caa9e

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