Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfd5b1c2bbe89de…

MALICIOUS

PDF

48.0 KB Created: 2021-05-15 23:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a3ba7d01b525765ab08b7c3d226d2f92 SHA-1: 64e1a00a54eff274a29abd53557c7c5335529f12 SHA-256: dbfd5b1c2bbe89dec547498995d6664d0cc61f0d614d90e3fce45f2aaa42aa57
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is https://netcdn.xyz/app/431946152/get-free-robux-no-human-verification-game-hack. This lure is a common tactic to trick users into downloading further malware or visiting phishing sites. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/get-free-robux-no-human-verification-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/wurst-mc_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-daily-gift-free-spins-and-coins-link_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_off000049dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DD 27752 bytes
SHA-256: 2b2042f682a671f96e911f1edfc3ced367622e6e9f6dac817c5cef4483cb312d
font_01_sfnt_off00008a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A60 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00009787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9787 18860 bytes
SHA-256: 77094cb8e4b41d81131149df95963a95cd1356d500cc75fcdf894a2f9afc6be7

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