Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3961bb20bc6e46…

MALICIOUS

PDF

44.2 KB Created: 2021-05-16 11:44:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ab8be477d6f7aef5c127a11bb2a96978 SHA-1: 685c1c4a65a0699ed631bf76dc5ede7772085a9a SHA-256: cd3961bb20bc6e46dea1837f1b7bd74fdd0b9ecf487b761a1f2dea5d2820d765
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a visual download button lure, suggesting an attempt to trick the user into downloading a secondary payload. The ML classifier also flagged this PDF as malicious. The primary malicious URL identified is https://netcdn.xyz/app/406889139/spin-coin-game-hack, which is likely the distribution point for the actual malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/spin-coin-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004908.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4908 25268 bytes
SHA-256: 62c8568c94299b3dffacd16b2ffe6c9ab214e581238c1dd86f0def2764be7d7d
font_01_sfnt_off00008296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8296 3000 bytes
SHA-256: 56ee3cf210babcab1d595ec3cc7d666f7a646b8ea00ab1e6563ebd84f84582f8
font_02_sfnt_off00008cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF5 17392 bytes
SHA-256: b56bff47aa771abc34fd6f7ab31864e8be47b484c749d0c581bff3c59f183b7a

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