Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4e9da7bb8c2993…

MALICIOUS

PDF

44.7 KB Created: 2021-06-10 16:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b4e85bade314ee3f007b8206b34f817 SHA-1: 403bdbccb4c1d779e12155f924a057801b6efa5c SHA-256: be4e9da7bb8c299390eaa9a6143df26f7f5448e66acacf1f037432183919072e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure of 'Free Robux 2021 Generator' to entice users to click on embedded links. These links, such as 'https://netcdn.tw/app/431946152/free-robux-2021-generator-game-hack', likely lead to malicious websites designed for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-2021-generator-game-hack PDF link annotation
    • http://easytransferbrazil.com/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-health-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://easytransferbrazil.com/images/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-daily-free-spins-hack_GM406889139.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_off00004f06.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F06 25640 bytes
SHA-256: 5c5d6fd2fa753d02a755439578cf79e5e826ca5e60d31868777bf565ec0b3149
font_01_sfnt_off00008a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A86 18748 bytes
SHA-256: c43f596d4f107eb8f1f849b4de490d9a92933155ac8f94aa0ebdcc9071b08d0e

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