Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3dede39c731465…

MALICIOUS

PDF

44.2 KB Created: 2021-05-19 14:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b4d6e9c02a91d4a9d2c2ff495758290e SHA-1: b4ffbee458937cf7563cbba5634f78dd1a656fa0 SHA-256: 3c3dede39c73146531e55d412cbecb40835270dfda8a5cdaa424505ac8eb331b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating a malicious redirector and a lure for game hacks, impersonating Microsoft. The primary link directs to `https://netcdn.xyz/app/431946152/free-robux-without-survey-game-hack`, which is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to a phishing or malware download site, likely leveraging a client-side exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-without-survey-game-hack.
  • 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/free-robux-without-survey-game-hack In PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/near-tiktok-free-fire_GM835599320.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-robux-no-human-verification-or-survey_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
font_00_sfnt_off00004b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3C 27124 bytes
SHA-256: dbfe4b479987e17b2378a8380530c29b7f6cc8975efc2e4cb1f1ad316382c853
font_01_sfnt_off000088c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 18896 bytes
SHA-256: b0c1a7c96aa264be318e1ab456a0b915a72e0bc05fcf36e1ad74b726c9d43bb5

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