Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0833fc3a23e5178…

MALICIOUS

PDF

35.6 KB Created: 2021-07-02 08:31:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3c21ffe7c37f41557b9e9d703c5e5a07 SHA-1: 5015021342c787988cd53277d02f7fa8e221ad80 SHA-256: c0833fc3a23e51785aefab4c830555aacd255c7a8b29a3aa331f73a1740f2eff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links confirms a malicious intent to lead users to potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs suggest a social engineering lure, likely delivered as a spearphishing attachment.

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/roblox-free-robux-hack-i-impress-all-your-friends-game-hack In PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/fps-hacks-roblox-aimbot-not-pf_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/join-roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/gift-free-robux_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/robux-free-roblox-2021_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/tiktok-free-ads_GM835599320.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/roblox-hacks-trial_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/reddit-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/roblox-build-a-boat-for-treasure-free-vip-server_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/cheat-bar-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://smagripadps.sch.id/new/public/ckfinder/userfiles/files/team-panda-free-robux-website_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_off00003321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3321 22088 bytes
SHA-256: f051cc7f6969bc286e5a0a1baaef4066df0e744566692047d39dd48a197dbd4a
font_01_sfnt_off0000642b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642B 19852 bytes
SHA-256: 0acad2d2fd8c0d5ee36ba44b81bb70925b860fe209b91b4e45c2b5c33b21a270

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