Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c33a4cb83f8893…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 14:36:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 49fa4a2651344e80d91fbb5defe8ca6b SHA-1: 95dc1ce49e7abc2636fa4ad530877174f2638fde SHA-256: b1c33a4cb83f8893995ec350b0eccdc3eec537236ee9eb1fbedb074ddf17019d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that lead to malicious redirector infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary URL identified is http://netcdn.co/app/431946152/how-to-hack-any-roblox-account-2021-game-hack, which is associated with a lure for Roblox account hacking. This suggests the document is designed to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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/how-to-hack-any-roblox-account-2021-game-hack In PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/keisyo-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-free-robux-event_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-auto-farm_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/synapse-x-roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-pocket-edition-free_GM479516143.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/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/welcome-to-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-hack-menu-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/prestonplayz-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-cheat-codes-for-money-on-jail-tycoon_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-2021-pc_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-macbook-version-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-promo-codes-for-roblox-2021_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_off00002ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EBB 22516 bytes
SHA-256: 9d12643d261e7fa8f09a64b00b7000d30068b6d1755a35a4562bd44116988755
font_01_sfnt_off000060e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 19644 bytes
SHA-256: b0514a9916a3bfc6807ff6966889b9805cea5f800b0a9b6628ee50a9401eba91

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