Malicious PDF — malware analysis report

Static analysis result for SHA-256 c612a7557b24d62d…

MALICIOUS

PDF

43.8 KB Created: 2021-05-15 07:07:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0918b64282035c279e4becf8b13c607 SHA-1: c6816558aae8f5b8d53048a114bb12fb646841e6 SHA-256: c612a7557b24d62d0b25f348bfa73b1b41d2d4c77505946d21d81597437ca382
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly flagged this PDF as malicious. The document body and embedded URLs point to websites offering game hacks and free currency, a common lure for phishing or malware distribution. The presence of multiple suspicious URLs suggests an attempt to redirect the user to a malicious site.

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/406889139/how-to-watch-ads-for-free-spins-in-coin-master-game-hack In PDF document text
    • http://ctr74.net/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/free-coin_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/roblox-hack-codes_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
stream_003_off00004707.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4707 29092 bytes
SHA-256: 969fe6980b14288bae86f6ab28b64f6b8e3e27ea0f3adf4122e7df90ffd57548
font_01_sfnt_off000087ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 18588 bytes
SHA-256: e85a40edf041e1b7da9f8a2b2394a1380fc1c3be96b7267e169ee1eb63bf68c8

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