Malicious PDF — malware analysis report

Static analysis result for SHA-256 c255423ad012fc0a…

MALICIOUS

PDF

33.0 KB Created: 2021-06-28 21:33:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a7888db4e6c2d7dcb8b5daf35de9f444 SHA-1: 77846f91912c2502764d52ec8dab3227b4c23e25 SHA-256: c255423ad012fc0ae2085082f2a88eb6594f897adaf4bf32ea64a859bbdc6655
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and text promoting 'Roblox Hack To Get Free Robux 2021' and similar lures. These links redirect to malicious infrastructure, specifically http://netcdn.co/app/431946152/roblox-hack-to-get-free-robux-2021-game-hack, which is flagged as a malicious redirector. The document's primary purpose appears to be social engineering users into visiting these malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/roblox-hack-to-get-free-robux-2021-game-hack In PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-piece-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hacking-guide-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/find-what-game-a-roblox-player-is-playing-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-groups-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/copyright-free-roblox-template-shirts_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-lumber-simulator-2-hack-script_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-injector-2021-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-generator-com-oprewards_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/freerubux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/cheats-in-dragon-adventures-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-do-i-hack-someones-roblox-acc_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/descargar-hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/official-coin-master-free-spins_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_off00002ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AE3 21792 bytes
SHA-256: 5852bb45495754836895f932f03ecf09b54046f7a8b71ca02afe9f213a5f1f48
font_01_sfnt_off00005af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF4 19468 bytes
SHA-256: cbd6767a298a06e4574876f4c4d0b5f77c82c6a5a2162296a70226486a699e70

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