Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ebf5fd7d1e6291…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 17:45:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9523e62a2083d5ceb80d6a3810d9f9de SHA-1: 0975275189b83c6fdb56ae9119631d6d5b25481f SHA-256: 33ebf5fd7d1e629109c201414a33eee210081dba55fc970ae8b0cf9265e331a2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators for popular games like Roblox. The primary lure URL is http://netcdn.tw/app/431946152/how-to-change-your-name-on-roblox-for-free-game-hack, which is designed to trick users into downloading further malware or engaging in credential harvesting. The document body and embedded URLs reinforce this social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-change-your-name-on-roblox-for-free-game-hack In PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id//repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://e-library.stienobel-indonesia.ac.id/repository/roblox-jailbreak-hack-download_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
font_00_sfnt_off00003112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3112 22144 bytes
SHA-256: fb5a82b8eec71cdac285737fc6e11671d27822a2c20a686ea84e0d664fa1d061
font_01_sfnt_off00006225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 19540 bytes
SHA-256: ce7cb55d619ef9cd49366302c9bae7af013f2cb024a6f61c136bed6f0a856416

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