Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edbc41c82ec7482…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 07:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 32da6b49e6726b222a7f87093ecc1868 SHA-1: 84195683430375526a2efe0fc8b70076976e46b0 SHA-256: 4edbc41c82ec7482210d6fac80adeef10566004486f4b78ab1edbc69b94ed344
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on luring users with 'free game hacks' and 'generators'. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly suggests this is a social engineering tactic to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence indicate malicious intent, likely to download further payloads or phish for credentials.

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.online/app/431946152/free-roblox-intros-game-hack PDF link annotation
    • http://oca.undil.tl/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-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
stream_004_off00004f5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F5A 25496 bytes
SHA-256: 1e50ea046843d3ea9472f3f80d2e517280659cd4e398219e4d8d66e78b3f17c4
font_01_sfnt_off00008a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A34 18052 bytes
SHA-256: 96373f35ee075c3be11c8e4c64eb77f13cb7d9769cc235bfbcc2c5e9d23a424f

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