Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b48c91e237b34a6…

MALICIOUS

PDF

35.3 KB Created: 2021-06-27 07:20:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2003fe5e8bf20f7d94b35499925a4393 SHA-1: 69fda7e006349c455b5bc88328b5450ab7802074 SHA-256: 4b48c91e237b34a60091306dcf5abafbe08a60b80ffa0b9a65579a22cb3c8ab5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/hack-roblox-exploit-wearedevs-game-hack. This infrastructure is used to lure users with promises of game hacks and free currency, likely leading to further malware downloads or phishing attempts. The document body and heuristics strongly indicate a social engineering tactic to trick users into clicking malicious links.

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.co/app/431946152/hack-roblox-exploit-wearedevs-game-hack In PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-hack-into-vip-rooms-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-robux-hack-apk_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/hack-bighead-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-hacker-2021-download-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-robux-on-roblox-ipad-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-hats-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-free-without-sign-in-no-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-roblox-accounts-with-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/download-hacked-fersion-of-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/infinite-speed-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-spin-gratis-coin-master_GM406889139.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_off00002fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDC 22908 bytes
SHA-256: 91bc5c4e463d0f49f8ee976b647cc36f4e117c6bfeafc920df7a2fb7e5b2bfba
font_01_sfnt_off0000633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 19544 bytes
SHA-256: f574a625ffab2ec4fd57df060be498d044a98c5ffbb6745b7933d064308c6de4

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