Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48959c704632bb3…

MALICIOUS

PDF

32.1 KB Created: 2021-07-20 15:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 757a343aab3902f59487c949ff469db0 SHA-1: 2ada9fd4b572e2c40713845cceebe4a9d390d1a5 SHA-256: a48959c704632bb3d6018b7d5d85096e380dca4309616a78cd3e882cda4a8348
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://netcdn.tw/app/479516143/minecraft-free-online-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-com_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_off00002b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B22 22684 bytes
SHA-256: 662d62dc45942d685a10420ab9b5d9075fa86dcb0f82b0fa5950291fc6e5b7de
font_01_sfnt_off00005d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 17644 bytes
SHA-256: d3a8b3d8bd2249c6206e1557dca74d08ec9c3b58c2328dc4779a04ae87c22ca2

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