Malicious PDF — malware analysis report

Static analysis result for SHA-256 af24547862847b6c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 22:33:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a186a4905792e7b0d6135521bd3ab73c SHA-1: 39eabb2302a08c061e206e08cc4592e226fc1334 SHA-256: af24547862847b6c34952460029cd4d5632eb79f977c68638bd815be5b3b9f9a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirector infrastructure, specifically designed to lure users with promises of free game currency or hacks. The document body and heuristics confirm the lure is related to 'free robux' and 'game hacks'. The ML classifier strongly indicates maliciousness, and the embedded URLs are the primary indicators of compromise.

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/how-do-you-get-free-robux-game-hack In PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-hacks-for-mad-city_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-support_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-bypass-the-roblox-cheat-engine-bypass_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-shirt-template-free-to-use_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.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_off00002ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF4 22544 bytes
SHA-256: 78d8d5e9348a40acadc32799e6b9cec67c022347f1acf99323f0fd64b41ba6fc
font_01_sfnt_off00006254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 19316 bytes
SHA-256: 99209f55b8a3eadb57fc79f11dd938dc70b993b67b3cdd4e22b37a6312af6b20

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