Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3f3b5b77e14fac…

MALICIOUS

PDF

43.5 KB Created: 2021-05-11 05:43:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c5497fb9332314dccd76c33050cba2db SHA-1: 7779b349015ca0291019623dcdcfd974f8a7fa14 SHA-256: 3f3f3b5b77e14facb422231fde7a23fe851b122e67d0cc5f6db782f4764a7ef3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free Robux and game hacks, which is a common social engineering tactic to trick users into clicking malicious links. The document contains multiple embedded URLs, including a primary redirector at https://netcdn.xyz/app/431946152/free-robux-group-game-hack, which is flagged as malicious. The presence of PDF-specific heuristics like 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicates a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/free-robux-group-game-hack In PDF document text
    • https://www.chorwacjaapartamenty.com/images/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/daily-spin_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/worst-client_GM479516143.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/10-robux_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/e-free-roblox_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_off00004a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9B 24516 bytes
SHA-256: bbe4b72a49d0f64d7d3943225fa3d989165ac50ff7e3c6b30d962cc5ca69670f
font_01_sfnt_off000082c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C8 19968 bytes
SHA-256: cd0b9b9872e8ed658c91b33efc62603d972bf19833c13a058f3053b75ba8a10b

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