Malicious PDF — malware analysis report

Static analysis result for SHA-256 42febad1bf31e6d7…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 10:44:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7a93bf67c0044c355f6557b886a8808c SHA-1: d3973768f8b604574a19a01d4b74282387ed7fac SHA-256: 42febad1bf31e6d7580d25ea8f5805f148c61cdcd57ffcc4f5bcc8534d12d29e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing users to a suspicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs suggest a phishing or scam attempt, likely leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/how-to-get-free-robux-without-doing-anything-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-you-get-free-food-in-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_off00005198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5198 24652 bytes
SHA-256: 84380be753086615371b5f23c862383dadfe433aa0f74358017245cc1ae4f1cc
font_01_sfnt_off000088d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D8 19400 bytes
SHA-256: 843e7c6de0628ecb74dfde19cdfb212261a67f0d6d996bc16e2547f6c0bce3d3

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