Malicious PDF — malware analysis report

Static analysis result for SHA-256 51618ee41a1ab2f9…

MALICIOUS

PDF

41.5 KB Created: 2021-05-17 12:15:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1e53da4116f1c6fe4ce51c7217d7818a SHA-1: c895764777795bd1b5e1c7d1b164e797de8d196a SHA-256: 51618ee41a1ab2f93e2d39762a1083d7a8790c816bea143a23a029599df379ef
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/get-free-spins-link-in-coin-master-game-hack PDF link annotation
    • http://calavera.be/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-home_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://calavera.be/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://calavera.be/images/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://calavera.be/images/free-robux-generator-com-roblox-hack_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_off000048ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FF 24400 bytes
SHA-256: c32eadc125493052f06f5466149954ee5912817267fb51e6fe76a914c69db8d4
font_01_sfnt_off0000809c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809C 18056 bytes
SHA-256: f380940be241d9e71387f2f3589a8e8f230fef98b18032ac799d1791a5bb6cec

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