Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd51b6d0654087…

MALICIOUS

PDF

44.1 KB Created: 2021-05-11 00:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 466f45678aede8bc2f03508d361a70f5 SHA-1: 90408ba96511e46946b58e88ce105b3328194e13 SHA-256: b7cd51b6d065408740b3961f81d4b0916bf5a844e19d05a4b86ee868bd2b6401
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' to lure users. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-hack-without-downloading-apps-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector chain designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-hack-without-downloading-apps-game-hack In PDF document text
    • http://karldall.dk/images/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://karldall.dk/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://karldall.dk/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://karldall.dk/images/minecraft-tools_GM479516143.pdfIn PDF document text
    • http://karldall.dk/images/how-to-get-free-robux-hack_GM431946152.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_off000046c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C2 23932 bytes
SHA-256: 638fb66eece73593f75c0b1db087dfba901619e45e66e0aec7fda68a61d97d8f
font_01_sfnt_off00007d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D11 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000086c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C3 19264 bytes
SHA-256: 99f86527aad2d2c4e0c2a6dc22010d489b80471d19b97ecb32fe988289f363dc

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