Malicious PDF — malware analysis report

Static analysis result for SHA-256 851fdc3d90ce3d45…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 12:41:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 548033110778d485b06d915c87fe4112 SHA-1: 6d973776ac356e3f7242b831bf6306e782ddef4e SHA-256: 851fdc3d90ce3d45b3f49b93a16439d3bd6da8b793510757c5276d3d6002b2b4
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body, though partially corrupted, contains text related to free game currency and includes URLs that are part of the malicious redirection chain. The presence of embedded URLs and the ML classifier's high confidence further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/village-coin_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://kakipalsupekanbaru.com/ckfinder/userfiles/files/roblox-hack-client_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
stream_003_off00004ac4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC4 25108 bytes
SHA-256: b12fb83c15e948aa2d31b877caba491f185e0a0a42d634542013286013bfb3d9
font_01_sfnt_off0000846e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846E 18344 bytes
SHA-256: a3821bea5d8002917ca36036ff520c3c0be187df4be91a81bd8356ddd2b369c9

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