Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26533b7a210cad9…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 11:26:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a82b5034f943bfdb8d981b492447aa6d SHA-1: 8d1929d7772a775e526af7edc40f7071de3d35da SHA-256: c26533b7a210cad951d7c493ff3eaa1ef7df43477444ed0c9aedc97f0ec906b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a clear lure for 'Free Robux' and includes an external URL pointing to a download location. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were explicitly extracted, the presence of an external URI and the document's content suggest it's designed to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-without-verify-game-hack In PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/pokemon-go-free-808_GM1094591345.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/get-robux-today_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_off000050e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E3 27656 bytes
SHA-256: d1f336325e5dbfb9cda03a3453ac649ac67a1448283f143a26dc5a4fc9ff4812
font_01_sfnt_off00009064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9064 18916 bytes
SHA-256: 511fbd4ba16aacf51779f52d01f2fc894dffaba514ce449b994b41b42032bc0e

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