Malicious PDF — malware analysis report

Static analysis result for SHA-256 48359b6575cf3ff7…

MALICIOUS

PDF

43.7 KB Created: 2021-06-11 04:23:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00374b11c7ee31c64daea559c0079016 SHA-1: 25bf60ef66a167ac02078b5d9c3d9bdd2b2d9f2c SHA-256: 48359b6575cf3ff78c338659b592d85432c03f4b338e2d7494225e659c93ef7b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/free-charactes-in-roblox-game-hack PDF link annotation
    • http://szekelymozes.ro/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/dll-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/roblox-cheat-engine-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/roblox-coloring-pages-printable-free_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/robux-download_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://szekelymozes.ro/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://szekelymozes.ro/images/robux-game_GM431946152.pdfIn PDF document text
    • http://szekelymozes.ro/images/legit-free-spins-coin-master_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_004_off00004f40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F40 24576 bytes
SHA-256: 9eace89fa55143817ca2c232df26533abd9575df0cd8de9f74cc469a27ab3d2f
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 18448 bytes
SHA-256: 60720509bde0bb66b192bbd17cfbb6ebd7783fc9eeff0f87397245a0f1fe0cf9

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