Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dbf9787f21b92e…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 06:20:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3f94dd011cf94a3b35495092d66bd283 SHA-1: 9f2c824c8e2c68a15366b63986481204d431db53 SHA-256: c5dbf9787f21b92eb8bb2129606a27388912c066f380ca1f2300394bba2b3c56
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a lure for game hacks and redirects to an external URL. The ML classifier also flagged it as malicious. The embedded URL, 'https://netcdn.online/app/431946152/earnrobux-game-hack', is the primary indicator of the malicious redirection. No scripts were extracted, but the PDF structure and embedded URI strongly suggest a phishing or scam attempt.

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/431946152/earnrobux-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/pubg-uc-yatrma-sitesi_GM1330123889.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-pics_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005171.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5171 25588 bytes
SHA-256: c7d62b3ab147cc98b89528bf253c9fb6a502e7122cacb79aa0a85fe78b2052e0
font_01_sfnt_off00008d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D25 18076 bytes
SHA-256: 2721194a66b32dfdaea4e26ed0bd84b304de41eeda81871a4ffc347c5a8adb25

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