Malicious PDF — malware analysis report

Static analysis result for SHA-256 63436ca636c62cc1…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 09:24:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ecd26a973809889d274010d41123d627 SHA-1: cbb1c69accbaa481cb062f08858fa45c47246e23 SHA-256: 63436ca636c62cc13a467c9b7d446d0dd4def8054bb325ad567a8aaf37049aa7
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary link, http://netcdn.tw/app/406889139/free-download-coin-master-game-hack, is flagged as malicious. The document body and embedded links suggest a social engineering tactic to trick users into downloading potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/406889139/free-download-coin-master-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-hacks-on-midieval-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-project-pokemon-cheat-engine_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-bloxburg-for-free-without-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-free-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-valid-2021-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pastebincom-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-use-an-illuminati-skybox-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-mega-vip-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-face-girl-blushing_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-download-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-cash-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-adds_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/kengit-films-how-to-get-free-robux_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_off00002f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3C 22572 bytes
SHA-256: fc7637f74c270450821acadd444e88c67ae386fdf017334746b4cdfd3ea34b05
font_01_sfnt_off000061a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 18576 bytes
SHA-256: ba0db7d20da48e941f50dfa15a3fc29fea34058df87ad3f7e9723dbec04454cd

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