Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b4be9f026c6f5e…

MALICIOUS

PDF

33.1 KB Created: 2021-06-29 09:53:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 601c79d92c41e160a9e75e50084eb4d7 SHA-1: a178c3c62266b58825f51ea7bbeac9bc865ce2f9 SHA-256: 15b4be9f026c6f5e6dabca8543318a72f5a6cbf437daa9a25441a9359d5c1e1d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The embedded URLs, such as http://netcdn.co/app/431946152/inject-hack-roblox-2021-game-hack, are designed to lure users into clicking and potentially downloading further malware or engaging in credential harvesting. The ML classifier also strongly indicated maliciousness.

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/inject-hack-roblox-2021-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free4now-info-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/tiktok-free-svg_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robuxian-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-cheat_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_off00002c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C44 21308 bytes
SHA-256: 6c6300edf582738398ec1e44818c4acd83f10a11e575f9f3a1dea8b71d7b3f4b
font_01_sfnt_off00005ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD2 19348 bytes
SHA-256: d2e63f32ef70f63552028045e22cab40f9d3b153f25f48e5edf8d29b3129129e

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