Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ac5885a4087e88…

MALICIOUS

PDF

34.3 KB Created: 2021-07-01 17:17:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4f0b63aaf9db40ae5840401ac52da8cb SHA-1: d70125fae47fe64ea1bc0df73fe8db7bbd1969f1 SHA-256: 71ac5885a4087e88d4fc1699b79eb89075e4037a6ce4949a0207c4a016d76402
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links and a call-to-action phrase designed to trick users into visiting a URL promising 'free Robux' or game hacks. This URL, http://netcdn.co/app/431946152/get-free-robux-now-no-human-verification-game-hack, likely serves as a redirector to a malicious site or directly downloads a payload. The ML classifier strongly indicated maliciousness, supporting the lure-based attack pattern.

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.co/app/431946152/get-free-robux-now-no-human-verification-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/robux-hacks-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-codes-mining-simulator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-javascript-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-de-fly-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/5-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-hair-roblox-not-moel_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-catalog-items-roblox-2021-december_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pubg-uc-via-login_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-game-free-spin_GM406889139.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_off00002f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1F 22024 bytes
SHA-256: 3c08613d9fa961c8aeae4c36269889b36359cb050711199055d6c47b9f32ae1f
font_01_sfnt_off00005fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 19496 bytes
SHA-256: 8c3a3e2a7908bc805903ccb4e4976a6af6001c3e18a173d1137cefa59d9599e9

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