Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adebd5427906392…

MALICIOUS

PDF

44.7 KB Created: 2021-06-07 19:45:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 41172e53012b3e327c93190d6e8f4eb5 SHA-1: 101fb6820d24ba8127743289b4aee3e04cc7ce70 SHA-256: 3adebd5427906392d67e616d423872e66fedf4aac839cff8510e876c5c5d5215
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. The presence of a fake CAPTCHA heuristic further suggests a social engineering attempt to trick the user into interacting with malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely attempt to redirect the user to a malicious site for further exploitation.

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-robux-for-joining-groups-game-hack PDF link annotation
    • http://fotoflas.gr/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-hack-no-verify_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://fotoflas.gr/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://fotoflas.gr/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://fotoflas.gr/images/coin-master-free-spins-for-today_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_off00004f3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3A 25512 bytes
SHA-256: 45f704f794932bbcc2d1a002b71b7f38aaf72c5cf8c4c04e44309ff2f7446ba9
font_01_sfnt_off00008aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA3 18764 bytes
SHA-256: 118d73e4764451fbc65b0b2070f4d3659b3fb9df4180c12f8e637de15444a98e

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