Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db63fce6bfcfdae…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 11:58:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6229d3f00aadc5b0a8971ab3b9706b0d SHA-1: 9a90105a4949ccb4ee47ce1346ab4480affb182a SHA-256: 8db63fce6bfcfdae12f7e19b9be4debe86baf0f23d5bd22a8a18749f548042fa
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for a game hack redirect lure, pointing to the URL http://netcdn.tw/app/431946152/oprewards-com-login-game-hack. The document body also contains this URL and numerous other links related to game hacks and free currency, reinforcing the lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/oprewards-com-login-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/truco-2021-hack-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-roam-camera-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-play-now-for-free_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_off00002d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D2C 22640 bytes
SHA-256: d99bcba1a88c50ffbc08d7593b00f5198d1c1c02aa2e48729e8153bff728a9f8
font_01_sfnt_off00005ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 18936 bytes
SHA-256: 7041adf8518710a4413aa32982ce6c5947ef6f4aebe4e34a0e44fd0e6289633e

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