Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d82d189dba11dd…

MALICIOUS

PDF

43.2 KB Created: 2021-05-11 08:08:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b262d2ffcd309a9697a23b434f069a29 SHA-1: 618c721470f462d0e63bc452922e085eb3c4b32a SHA-256: 52d82d189dba11dd761ba859d42943c22fed6302d94b99c8e85ea104218be6ab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a heuristic firing for external URIs, all pointing to websites related to game hacks and 'free Robux'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to these lures, suggesting the primary intent is to direct the user to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/can-i-get-free-robux-game-hack In PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/wizard-hacks_GM479516143.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/dailyrobux_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/krnl-download_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/easiest-coin-master-hack_GM406889139.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
stream_003_off00004c95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C95 24912 bytes
SHA-256: 700c8e174cab9f680cdd0be1daed77b38d03bd29121a915ac8a8e6e1a6254fa0
font_01_sfnt_off0000867b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867B 18344 bytes
SHA-256: a3821bea5d8002917ca36036ff520c3c0be187df4be91a81bd8356ddd2b369c9

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