Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8c16b6c22e5e68…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 20:29:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 02021fa15fdb8e844542b7219e7b7b97 SHA-1: 1520dd7a99e5c75984b0d4d7fe26377be48fcd45 SHA-256: fb8c16b6c22e5e68b76b3d5a4ba27a86c75009f713a2aa1a11c8b67a285ed023
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The primary link, http://netcdn.tw/app/431946152/free-robux-codes-generator-no-verification-game-hack, is designed to lure users into clicking, likely leading to further malicious content or phishing pages. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to exploit user interest in gaming rewards.

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.tw/app/431946152/free-robux-codes-generator-no-verification-game-hack In PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/roblox-hack-apk-para-pc_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/buy-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/is-adopt-me-on-roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/roblox-free-adidas-shirt_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/free-btools-for-roblox_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/ways-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://serviceaccctvjogja.com/ckfinder/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CD 22660 bytes
SHA-256: 7b9794eeeb0be68160e417460645eaab8dbc85854dbd0ce078c313cab41d293f
font_01_sfnt_off00006474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 19248 bytes
SHA-256: ae2c0d8972e31d5fd2442df1a166e7aa138b9e721d28ea80a1459ad28ac3a5a0

Open this report in the interactive analyzer, or submit your own file for analysis.