Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0f8ceafcb880b2…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 10:43:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8c0d5516f37dff20635c080cdd319ce7 SHA-1: be8b6a99e860065d7ae26586a6c0066859a5acab SHA-256: 4a0f8ceafcb880b23fc609acbadd69a277f1cc03be1e157dd5eb70b6e2b9370c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs and a visual download button lure, indicating an attempt to trick the user into downloading a secondary payload. The ML classifier strongly flagged this PDF as malicious, and the presence of URLs related to game cheats and free currency suggests a social engineering tactic to deliver malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/free-spins-coin-master-app-ios-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/infinite-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-scam_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/earn-rbx_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_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_off00004e59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E59 25640 bytes
SHA-256: 0d4255a87583d1e5329a681f93345532c49ab2d31651c71e9d888006453b5572
font_01_sfnt_off00008921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8921 17884 bytes
SHA-256: baa69023d18af7e6e292b7ed0352255ac8c665d65dfdd35f206937513cc9840e

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