Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc8184c5047c717…

MALICIOUS

PDF

42.9 KB Created: 2021-06-07 16:37:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4a14baa03be48879c72412e189a6f5c4 SHA-1: 92d6e7859f273f0c704577bed35b3db36359e7c9 SHA-256: 5bc8184c5047c717d7bcced96d67106a20dba915774c316ee6fcc8aadeadc952
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generator' and 'game hack' lures. The document body, though partially corrupted, contains text related to 'free Robux' and includes the primary malicious URL. The presence of these lures and redirectors strongly suggests an attempt to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://netcdn.tw/app/431946152/how-to-how-to-get-free-robux-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/tiktok-free-view-iphone-apps_GM835599320.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-no-download_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_off00004d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5B 24300 bytes
SHA-256: bfad7fe09fe408ca3beee88994a9698a6d981ac8f7f9f340848cf07bcb0fbecc
font_01_sfnt_off000084e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E7 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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