Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c4f1827abf1feb…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 09:39:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9af4c034b88d08f976e4771ac2d19d50 SHA-1: d206324510235ddf56fde4224330c9a5bb89d56b SHA-256: a5c4f1827abf1feb24024acda831c206939cf98ae0551d1d1be768dbee4c8112
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'game hacks' and 'free Robux', a common lure for malicious content. The primary URL, http://netcdn.co/app/431946152/ban-roblox-pour-avoir-hack-des-robux-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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/ban-roblox-pour-avoir-hack-des-robux-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/robux-win-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-how-to-be-builders-club-for-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-make-your-own-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/synapse-roblox-hack-dll_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-in-edit-game-hack-gui_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/ninja-animation-package-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-hack-pour-avoir-des-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-can-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-free-robux-robux-robux-game_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/https-wwwrobloxcom-catalog-keyword-freecategory-1direction-2_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-birthday-card-printable_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/what-is-the-secret-code-to-get-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_off000031df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DF 22236 bytes
SHA-256: 93713de4811af36c724203ce1f103ef4ccd7c20c8a1bc384d6d299ec51dcd2c2
font_01_sfnt_off00006307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6307 19352 bytes
SHA-256: a27775149aebc061725d8374b2b9a65dae2912b97b1166fd1de1fd25cdd0a718

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