Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc8f404dc558e38…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 01:26:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ad9403406015dcb591141a4396f6a2f0 SHA-1: 81f5cbb5f185c065154ebb22f6ef323b52363076 SHA-256: bfc8f404dc558e3835d023b3559bf9763156eb4d7a40ec4098615c41d2f08333
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a prominent external URI pointing to a download site for game hacks. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it serving as a lure for potentially unwanted applications or malware. No scripts were extracted from this sample, but the presence of multiple game-related download links suggests a social engineering tactic to trick users into downloading malicious content.

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.tw/app/406889139/mcpe-master-unlimited-coins-hack-apk-game-hack In PDF document text
    • https://opac.itp.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/da-hood-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-hack-999999-robux-movil_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-marketplace-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-vehicle-tycoon-cheats_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-lua-course-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/intentan-hackear-mi-cuenta-de-roblox-lyna_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/cheat-buddy-roblox-aimbot_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-gift-card-codes-2021-december_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/cool-free-tshirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/comment-faire-si-on-a-ete-hack-sur-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-help-free-robux_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_off0000302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302F 23632 bytes
SHA-256: 5337aa9226d6bf7fcec0ee939a4e7199100c10b9a9d321594b76c48fa642584c
font_01_sfnt_off000065ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EE 18876 bytes
SHA-256: e10fddf66f187be0e2cb1475a5dd66f9239aae3dc3a045fd3ebb4bdfa1b57169

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