Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad1fb9e3892685b…

MALICIOUS

PDF

44.7 KB Created: 2021-05-17 15:10:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 872419e89c9f0e665fee3c320ea711b6 SHA-1: 90b7b1b945e7d9b0a68ce7d4e1ba0363b98b8c9f SHA-256: 3ad1fb9e3892685bb4028585ee0b26f956640e575735d96ff332ce2001bddb66
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, disguised as offers for free game-related items. The primary lure URL is https://netcdn.xyz/app/406889139/extra-free-spins-for-coin-master-game-hack, which is part of a known malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/extra-free-spins-for-coin-master-game-hack In PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-hack-coin-master-ios_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_off00004b8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B8E 24172 bytes
SHA-256: 235d9691c6d2ee107347a29cea533f6dc29a1861fdce749d6cb15b4c0708bf09
font_01_sfnt_off000082d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D6 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C87 18096 bytes
SHA-256: 96bd0bb09572b3bddfd838baa4c331de3f827c8f9b81fb8d0ba3a71af1e92560

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