Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8d187ee47064cb…

MALICIOUS

PDF

46.1 KB Created: 2021-06-07 03:45:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a6ccd1c2e6a80a8b7e90e611787c382a SHA-1: ed303371a7f0e692483b0261e7ada959d091b301 SHA-256: 6c8d187ee47064cb5fa8490efdc576c6aed61a16c96946b40524173466ec7f41
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, masquerading as game hacks and cheats. The primary lure directs users to 'https://netcdn.tw/app/431946152/roblox-cheats-for-android-game-hack', which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to trick users into downloading potentially malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-cheats-for-android-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-800-robux-for-free_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
stream_004_off0000521b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521B 27512 bytes
SHA-256: 13fd3db14ff68c588ee8216b6acfab3a7cc0c2e05a2c5b47117ebfdecc3f871e
font_01_sfnt_off00009046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9046 18740 bytes
SHA-256: 864041a2f4e6bf25502a2fc7018cc3edbc4331a88bf35813bf00f86371975a68

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