Malicious PDF — malware analysis report

Static analysis result for SHA-256 522397bbad2ea0b1…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 23:35:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 61ad219bf560017baf827e6e38bd4e4d SHA-1: 9f62c3b7f29fcf4c55ee02d3bce1def09b387761 SHA-256: 522397bbad2ea0b1267dabcb3f53a8d10f064778988a7dc5c9dceba6ade73d24
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and 'game hacks', directing users to a suspicious URL. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to a potentially malicious site for further exploitation or credential harvesting. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/431946152/how-to-buy-robux-for-free-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.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
font_00_sfnt_off00005188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5188 24552 bytes
SHA-256: 16cbda0794cd26a57a56af4fcd04ec1e44a42d00f558a601e1fb909e443f929c
font_01_sfnt_off000088a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A4 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off00009264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9264 18356 bytes
SHA-256: 42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866

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