Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39888227b1149f1…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 13:28:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9aae88d3dcf96f646cfb50b76632992d SHA-1: 064fd0597b9cc532da230ba70cedd7419af84bc6 SHA-256: f39888227b1149f1a53b22c6040e2105136a69aa0ad7ce6bc5ac27125bcfcc83
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing for a 'GAME_HACK_REDIRECT_LURE', indicating it directs users to a site promising free game hacks. The embedded URL `http://netcdn.tw/app/431946152/rbl-gg-free-robux-game-hack` is the primary indicator of this malicious redirection. 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/rbl-gg-free-robux-game-hack PDF link annotation
    • http://lib.fekon.untad.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-codes-2021-may_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/aroboy-10-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-gamepasses-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/picture-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hack-vehicle-simulator-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-free-online-no-installing_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hoot-join-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/best-free-roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-generator-no-human-verification-ios_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-hair-on-roblox-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
font_00_sfnt_off00002fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA4 22164 bytes
SHA-256: 5d147d10b9ba645513a4b2d5501f32d631d4b72e657330b96d1ad63143cfc78b
font_01_sfnt_off000060e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 18788 bytes
SHA-256: 59f9ca33a2a7e44c47b5adabbc3ceacc3a6bbd6ffe2d0380a638199fee6fbfd8