Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f291e4cb84c0912…

MALICIOUS

PDF

29.1 KB Created: 2021-07-19 08:51:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 61733216000097058bd49576a27f38db SHA-1: 2bf1fabb2685f25394877d7d5b1084c3fd8c67fb SHA-256: 4f291e4cb84c0912d4b804e2e91ee66e4ca95b86728286181744959cea1dcddc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure related to 'Minecraft Server Hacks' and 'free generator' to entice users to click on embedded links. The primary link, http://netcdn.tw/app/479516143/minecraft-server-hacks-game-hack, is associated with a high-risk heuristic for game hack redirects. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9359

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 http://netcdn.tw/app/479516143/minecraft-server-hacks-game-hack PDF link annotation
    • https://www.e-learning.man-purwakarta.sch.id/__statics/gudangsoal/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://e-learning.man-purwakarta.sch.id/__statics/gudangsoal/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://e-learning.man-purwakarta.sch.id/__statics/gudangsoal/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning.man-purwakarta.sch.id/__statics/gudangsoal/files/how-do-you-get-free-robux_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_002_off000022e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22E7 21604 bytes
SHA-256: 0eb5b35d7e2fe6c9c6e0dbf227e9f45053e39737d25bac9b0a6f8bb4a909ee03
font_01_sfnt_off0000515b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x515B 17852 bytes
SHA-256: d08e9f99218473ecffc4f3e4fddc043c571e48cf04331ee5ff23a4dc6866f563

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