Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5b4b056be94a8d…

MALICIOUS

PDF

36.8 KB Created: 2021-06-27 06:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ce0054b65071279b9262f977d3f75b6e SHA-1: a9aeb446116c6b4d43325c19d7ed085df55bbf86 SHA-256: 7b5b4b056be94a8d8693aa4d2f5bbff2d6477318a2d887773ce940bb71bca5ac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game hacks, directing users to a known malicious redirector infrastructure. The embedded URL `http://netcdn.co/app/431946152/how-to-hack-your-level-in-boku-no-roblox-game-hack` is a primary indicator of this malicious workflow. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack aimed at redirecting users to potentially harmful 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.co/app/431946152/how-to-hack-your-level-in-boku-no-roblox-game-hack In PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-free-robux-promo-codes-2021-june_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/hacking-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/2021-bt-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-to-hack-any-roblox-account-mobile_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/robux-gratuits-rapidement-cheat-pc_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-all-need-is-user-name_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/cheat-codes-for-dayz-roblox_GM431946152.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://www.naizak.com/uploaded_files/userfiles/files/cheat-files-download-roblox_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_off0000361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x361B 23092 bytes
SHA-256: 644e5a369b5cb0e0f0918a5529f94bbb2fe1a7f74367a3e524f502c9b13f097d
font_01_sfnt_off00006a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A24 19236 bytes
SHA-256: 7a1d72e9b4b6875e9fac2e153de46340aacbbc1c947798650f5c78013159e602

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