Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fb1b3ed45c699f…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 11:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ccc9abac9987dced3bdde66b7dfe2bbe SHA-1: 80ff7a329007f84327b201da64adc26264084c9f SHA-256: 72fb1b3ed45c699f42c62a0bda667ba20517e3017058963fbb701570b8e0bc33
122 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. 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 0.9969

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.xyz/app/479516143/how-to-hack-a-minecraft-account-game-hack PDF link annotation
    • http://www.jsvillas.com.tw/assets/files/whats-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/download-apps-for-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/weird-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-spins-generator-no-verification_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
font_00_sfnt_off00004dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD7 24688 bytes
SHA-256: 43067ede74c5c02a35233d5bc98093b22e059994f378ad28c556a7caf6aa1a48
font_01_sfnt_off000086e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E0 18184 bytes
SHA-256: 9b8f26e31d459421e9e5b83d6a53d579ef5ea49b0db69369fb37c1c5c6cb5db0

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