Malicious PDF — malware analysis report

Static analysis result for SHA-256 f839aaea833c5282…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 06:41:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a74aef67191f88d1c7f6597dce296bfe SHA-1: 3640152231bfd876f0c1ec7516b68f1ac1651ea8 SHA-256: f839aaea833c52824157f32c7ccc972d0f69d23d37e1547becd0e0849f8ccbe7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a website offering game hacks and free currency, a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of multiple game-related lures reinforces this assessment. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-free-coins-app-game-hack PDF link annotation
    • http://e-library.akademitelkom.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-games-com-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
stream_004_off00005036.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5036 25056 bytes
SHA-256: 4d30003078e4765d1b6a0e3e6a941b4a2449a985d774c12c83c77c49b3302d5f
font_01_sfnt_off0000896f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896F 17884 bytes
SHA-256: 3acccbbe7a83c149c22979297be8e0f2d1fa2551ed3d228e44848c7e1eaf2a55

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