Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4cac4e4ce8f3cd…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 03:26:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 10ec16a7cfbefa1600c9c2c94d83aefe SHA-1: 0de96ca81c2d0f41a8992307b2e83642d4f5d820 SHA-256: 6e4cac4e4ce8f3cdab21b97297158fd175709d7638488d1054b3f2e9689f7f13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into clicking malicious links. The embedded URLs, such as http://netcdn.tw/app/431946152/websites-that-give-you-free-robux-game-hack, lead to known malicious redirectors and other potentially harmful PDF files. The ML classifier strongly indicates malicious intent, and the document's structure and content align with social engineering tactics to deliver further malicious content.

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/websites-that-give-you-free-robux-game-hack In PDF document text
    • http://fobh.net/userfiles/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-roblox-with-dll-injector_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-not-clickbait-works-proof_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/game-toolbox_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-hack-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-roblox-with-inspect-element-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_off00002f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6D 22360 bytes
SHA-256: 62bae674ed83caa32125d52df9ca497462ecb388e5adb943ac1ddc9867b7dfb3
font_01_sfnt_off0000614b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614B 19580 bytes
SHA-256: 7292eb3338cb6c9d3aaa3bb5f0b07597ff2ce37f19197e11b99fdf35000b820a

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