Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b19e81dc0246ac…

MALICIOUS

PDF

35.3 KB Created: 2021-06-19 15:04:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9e96574c982df501d3217d18c7c83f00 SHA-1: b5d3f2df85d8694e2f574d7d5a8e72686f910ed4 SHA-256: 28b19e81dc0246ac67e7ae6edc990f7787e776fb2ca2a45bf32e3a14f52f3709
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including one at http://netcdn.co/app/431946152/hack-roba-cuentas-de-roblox-game-hack, which is likely a lure for downloading malware. The document body explicitly mentions 'Hack Roba Cuentas De Roblox', indicating a scam to obtain game accounts or currency. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.co/app/431946152/hack-roba-cuentas-de-roblox-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-advertise-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-for-kids-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-one-piece-treasure-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/easy-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-open-cheat-engine-without-roblox-shutting-down_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-download-2021-for-jack-the-monkey_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
font_00_sfnt_off000030ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CA 23128 bytes
SHA-256: 4ae84d8a4043b18d74327419865bf88a67d0bd04e5b8dbecd6912c5312cee543
font_01_sfnt_off000064e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 19068 bytes
SHA-256: 5979ef98abcfc19a0d577647f90e1db4a7ef1ecf31ca85d7b2b00f2113c01fd0

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