Malicious PDF — malware analysis report

Static analysis result for SHA-256 528fb94a790d88c7…

MALICIOUS

PDF

42.1 KB Created: 2021-06-13 23:26:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5a407c5c12d0e6c72d3b3251d2e7238e SHA-1: 489f156829b698cc9ddfd5b204843e843b8d270e SHA-256: 528fb94a790d88c7facaeda19cff8ebb65b84643aceebe64fb2a729dc12162c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency or hacks. The primary link, http://netcdn.co/app/431946152/how-to-get-25-robux-for-free-2021-game-hack, is associated with a game hack generator lure. The document's structure and embedded URLs suggest an attempt to trick users into downloading potentially harmful files or visiting further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-get-25-robux-for-free-2021-game-hack In PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/mcpe-client_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-robux-generator-hack-download_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-2021-roblox-accounts-2021-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/roblox-rc7-cracked-hack-exploit-2021_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/robux-page_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://juscor.com.br/ckfinder/userfiles/files/buy-robux-free_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_off000048d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48D2 24456 bytes
SHA-256: faef7a7bf633096dc9f6d20e33ab57d89d6733c19ce84f90c6ea91c8327681e6
font_01_sfnt_off0000806e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806E 18816 bytes
SHA-256: 0986cd0ec10415559eb0db9f0bddcae3cb21e1435fdfeef7330e29dc6ca074e7

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