Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed2ac75932c7c4…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 00:42:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d4f389cc62ce8e7fa81d273603cd57ed SHA-1: 791420ecdcb5900a5c3a658f207a9736a39e035c SHA-256: 91ed2ac75932c7c455d73841e478885614f760d48312b6a9d6a42da38847da42
160 Risk Score

Malware Insights

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

The PDF file contains multiple links pointing to malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary lure URL is https://netcdn.online/app/431946152/free-robux-groups-2021-game-hack. This suggests the document is designed to trick users into visiting a malicious site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/free-robux-groups-2021-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-gang_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-verification-2021-ios_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_004_off00004f56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F56 32424 bytes
SHA-256: 64bb1a3327ae24e761a8c5022a48c6d4e6a12698a45d0ddddc72feaf11823ec6
font_01_sfnt_off00009584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9584 18592 bytes
SHA-256: 40c688a228a34b1cb0523430700763228a7eb04120cc8b5f4f4e5fd2bdb4007a

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