Malicious PDF — malware analysis report

Static analysis result for SHA-256 5768cda450dcefef…

MALICIOUS

PDF

48.8 KB Created: 2021-06-11 10:36:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cd59fada4d9cfca0cdb4f5464933536e SHA-1: 59b8812aeb85a0d3f9b79c431df6731e48465dfd SHA-256: 5768cda450dcefefc1ba224aa40c0f4e1e6c243b99bf5ed7b96677c98570a936
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures for Roblox and Minecraft. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-studio-free-robux-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-login-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-island-royale-hack-script_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/dungeon-quest-free-account-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-do-u-get-free-random-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-points-for-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-into-someones-roblox-account-2021-october_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E9 27808 bytes
SHA-256: 370015684325ef13928f213fb354a89b472114c6b66b8fc882714406674661af
font_01_sfnt_off00008fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA7 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00009b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B48 18484 bytes
SHA-256: 5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe

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