Malicious PDF — malware analysis report

Static analysis result for SHA-256 191f0e32ea33fa40…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 10:00:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-22
MD5: 5d4f04f253d8f9343e6c0f4d6b3cbaf9 SHA-1: 0e40b1ab66eb4be52b23a5c0c8d806493266a6a2 SHA-256: 191f0e32ea33fa40d63f443c28ae1482df66a6ef3d014bc6e5acd5c743b7b827
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/hacks-for-roblox-jailbreak-game-hack In PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/counter-blox-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/play-free-games-roblox-com_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/robux-games_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-robux-generator-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-hacks-robuxian-secret-forum-hack-v11_GM431946152.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://www.samsoncc.com/uploaded_files/userfiles/files/roblox-play-now-for-free-as-guest_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F77 22540 bytes
SHA-256: 886521cbcc2afa9aff9ef6bd93313333b9128cf80279d2231f54f42fa656d37b
font_01_sfnt_off0000618f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 19104 bytes
SHA-256: 2b000729f5fa2c3c368f92ae190fbd8790038beb4804972d8c46b1aa4044e793

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