Malicious PDF — malware analysis report

Static analysis result for SHA-256 0beff57b31040f5a…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 15:40:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b6b25c6cefbbcc43ad87f8668d19458c SHA-1: 71e57c5633d294cbce4d4e71763fec26d7e1d79e SHA-256: 0beff57b31040f5a4ce56602d14f758fe13c46200a29a6687e7b16bb979bac68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free items. The primary malicious link identified is https://netcdn.tw/app/431946152/roblox-cool-and-free-hat-catalogue-game-hack. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a social engineering attack aimed at redirecting users to potentially harmful websites.

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/roblox-cool-and-free-hat-catalogue-game-hack In PDF document text
    • http://cosver.eu/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/roblox-cheats-to-be-able-to-say-numbers_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/roblox-free-stuff-obby_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-hack-robux-2021_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/pokemon-go-free-move_GM1094591345.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/pubg-770-uc-hack_GM1330123889.pdfIn PDF document text
    • http://cosver.eu/images/how-do-you-get-free-robux-2021_GM431946152.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_off00004fe2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE2 25196 bytes
SHA-256: aed1f780999d7651e22db92a8c1bc396af185aa6d2a4609bca959d31bb57b9eb
font_01_sfnt_off000089a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A8 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000935a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x935A 18884 bytes
SHA-256: 76e4a668c1abc6cff7dd86d1ec5350e038f82130187351ac572e04ce7a697ce0

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