Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6dab8e51211890…

MALICIOUS

PDF

35.6 KB Created: 2021-07-07 02:43:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5797499769ef4453490a9eb326d53ab7 SHA-1: e578f93015646a50e9e5e54b446c855ded6d4b12 SHA-256: 3e6dab8e51211890e2f9477b2e783af85a53f6eb421228c9adbd29f9099de93c
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack' for Roblox. This link, http://netcdn.tw/app/431946152/roblox-avatar-free-game-hack, is designed to lure users into clicking, likely leading to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

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/roblox-avatar-free-game-hack In PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/hack-para-boxing-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/tears-roblox-hack_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/hack-para-cambiar-tu-nombre-en-roblox_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/roblox-skywars-mega-vip-free_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/wizard-hacks_GM479516143.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://learningma.alkautsarkrw.web.id/__statics/gudangsoal/files/free-robux-generator-for-roblox-2021_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_off000034f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34F3 22224 bytes
SHA-256: 9cb64ee106a171e6890a6c38ec6fcf11262335cbf90c423242a3edd43e57e26f
font_01_sfnt_off0000669d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669D 18868 bytes
SHA-256: df626e97bf99c12ae2e2dc853053f4c46c230974655dd31d8497af8766a9dbba

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