Malicious PDF — malware analysis report

Static analysis result for SHA-256 f109f43dcf8517d6…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 04:51:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 776d12f7e8954a414d6f8c695d9728ab SHA-1: 9f7a3036afa262cb064c2573f8b6093cece03fc1 SHA-256: f109f43dcf8517d60f3011bf8a5791f228b4b5863e3ee12629858181c045ca0e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and a visual call-to-action button, strongly suggesting a lure to download a malicious payload. The ML classifier also flagged this PDF with high confidence. The primary malicious URL identified is https://netcdn.online/app/431946152/roblox-rewards-site-game-hack, which is likely the distribution point for the secondary payload.

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/431946152/roblox-rewards-site-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/tiktok-free-views-website_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/how-to-get-free-roebucks-without-verification_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_off00004d7f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D7F 27672 bytes
SHA-256: 505aeb5603e9bc7d71d59ad4cac02e2cdbc00e60dbbd10fea02891cab266be34
font_01_sfnt_off00008c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C79 18572 bytes
SHA-256: f83ae0dbfbb45e04c8caacad03ed19fd1097c60103a53bce71609c90e4e6ea01

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