Malicious PDF — malware analysis report

Static analysis result for SHA-256 868fbb67f7d6722c…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 07:00:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 49fc27224cbbcfb06857d83af744ec33 SHA-1: f53139c0693718aa067e138f60ce44782da51a78 SHA-256: 868fbb67f7d6722cf8f846e121f00ded5055052d374d244294a6c8160d30f5bb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a fake CAPTCHA lure and numerous external links, many of which are SEO-optimized slugs pointing to 'free robux' or 'coin master' cheats. The primary URL, https://netcdn.xyz/app/431946152/free-robux-hack-no-human-verification-game-hack, is likely the final destination for the malicious payload or phishing content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/free-robux-hack-no-human-verification-game-hack PDF link annotation
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fe.unismabekasi.ac.id/katalog-buku/repository/coin-master-hack-2021_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
stream_003_off00004ab7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB7 24868 bytes
SHA-256: 91db3d41a2d5b8d0318ba7953108ec4c1aa92f1530b0c886e842d1b71e6a4f83
font_01_sfnt_off00008410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8410 19028 bytes
SHA-256: 768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e

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