Malicious PDF — malware analysis report

Static analysis result for SHA-256 19613fdb5dc3ab61…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 09:21:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4e13a4563405e3863bb346ea3b8a3e42 SHA-1: 19270a009be790350ce33602bbe2137577f3e6bb SHA-256: 19613fdb5dc3ab613abecda743a6d87d318f34a126ffc5e32e173dbae8e581fc
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link disguised as a 'free generator / game hack' for Robux, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation.

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/to-get-free-robux-game-hack PDF link annotation
    • https://lib.insan-unggul.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-sued_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_off000050dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DC 26468 bytes
SHA-256: bf2f4cb9a48a63fe299367696c62002d86a01d0e12ab82841785ee4b1e1372c0
font_01_sfnt_off00008d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D50 18120 bytes
SHA-256: 5233d5aad1bcdd77905869674ceee15891b0fc77671f16174d37808cf9f58ee1

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