Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbbda30d9e67738…

MALICIOUS

PDF

42.1 KB Created: 2021-05-16 20:23:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5f14f801167ba2009f1945e82acbc979 SHA-1: 1c27850d29baf1e87bdcc8e8842aab71c1143234 SHA-256: 7fbbda30d9e67738fd3cd5007d9ce95e2bccceee9f7727d4312d4775724c89bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary lure URL is https://netcdn.xyz/app/406889139/coin-master-cards-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious websites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-cards-free-game-hack In PDF document text
    • http://calavera.be/images/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/master-coin-free_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spins-link-2021_GM406889139.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
stream_003_off000049ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FF 25920 bytes
SHA-256: de243233422f55850e84968315c3125810358e733ec82deb3c2569537b1f6fc9
font_01_sfnt_off0000836b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836B 17884 bytes
SHA-256: d54aa51eaaaa3e2864f0114713409e316145a0183ee6aba9be1e443db1dceb19

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