Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea36459db028d673…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 05:23:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7a3f951cf7b68d2a8c77bc877238dd14 SHA-1: eb0b7921ac37bab18269d3cb23fa6bd8555b14b7 SHA-256: ea36459db028d67396c87129306b9d8ed94a8c5baee16d72570863bee2f17654
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the document body contains a clear lure for free Robux, directing users to a suspicious URL. The presence of multiple embedded URLs further supports the intent to redirect users to external, potentially malicious content. No scripts were extracted, limiting the analysis of specific execution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/free-robux-no-verification-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/weird-roblox_GM431946152.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_off00004ebf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EBF 29420 bytes
SHA-256: f59752cf6e53cd388f440d66617f82449bc4bdee4cadd60089bb25bdc47f0ee6
font_01_sfnt_off0000914c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914C 2852 bytes
SHA-256: 6c344bff8cb11efcfa323542d02369dac514041cc19c9a49b1052cb126dcbdcf
font_02_sfnt_off00009b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0E 18600 bytes
SHA-256: 361892a278de990f6dfe9fe9f512a0ec39aeba1740037781b92f32c6ad2b5051

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