Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4103430a11a053e…

MALICIOUS

PDF

44.2 KB Created: 2021-06-14 00:55:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9d89d74f25f8351ae5891225199e4cc6 SHA-1: 489a05f755ce16abcc49c7e1f87877500638af1a SHA-256: b4103430a11a053e35ac8a5f4fc1fa400cdc668c484bd3bc479b12d24aa7a527
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games like Roblox and Coin Master. The primary lure URL, http://netcdn.co/app/431946152/roblox-account-steal-hack-game-hack, is flagged as malicious. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, which likely lead to credential harvesting or further malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.co/app/431946152/roblox-account-steal-hack-game-hack In PDF document text
    • http://educhina.mn/editor/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/best-free-minecraft-servers_GM479516143.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_003_off00004887.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4887 24016 bytes
SHA-256: eeac2a00650e383805447a14e4f6b11766a611ee13becb1d55c7ad5afad794e7
font_01_sfnt_off00007f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F50 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000895f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895F 18428 bytes
SHA-256: 223503b6dfe1d2b42a69816096d64c7cbab5ce5c8ba054135e005ba3b2eb604c

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