Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f6b7ed0d6df3a…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 05:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 518e46ee1eb2bfb1e6aef890710e7b94 SHA-1: 98e13fd0c6cd67178b91d009e1bcea50eaa9bc57 SHA-256: a71f6b7ed0d6df3aec7d8768f2fee79b41003f131eb2cdc11c7bca1b3bb70e25
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a game hack, directing users to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF's structure includes embedded URIs that lead to a known malicious domain. No scripts were extracted, but the overall pattern suggests a phishing attempt to redirect users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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-soins-game-hack PDF link annotation
    • http://e-library.akbid-purworejo.ac.id/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/app-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C8 25016 bytes
SHA-256: d35a6641c5c7cce3e25c0fb19804dd51ce13e4fea7cb623c939f4f1da2fecdf7
font_01_sfnt_off00008b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6A 2896 bytes
SHA-256: 98478e2fbfabd582329b6206c0d46f67523cf5e299cb16118f1065b4dd5ec6a6
font_02_sfnt_off00009551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9551 17712 bytes
SHA-256: a621fa0cf6ecf429ccb0e9762dad0d1971a2824e8730eca88621f5efe7e14995

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