Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1d63f1080fd3d9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 23:58:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 25c916a804071dd810aaa3ba4375a4ec SHA-1: 558f60667bcbd7f63a92e1d597d03870ad7752b9 SHA-256: bb1d63f1080fd3d95be09f2bd689906785ac2a83499c969783fda86945954bed
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-kid-friendly-game-hack, which is likely used to deliver a second-stage payload or lead to a phishing page. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest potential exploitation of PDF vulnerabilities or embedded JavaScript to facilitate the redirection.

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-kid-friendly-game-hack In PDF document text
    • https://ibelive.com.tw/image/data/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/pokemon-go-free-007_GM1094591345.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/roblox-kingadasouth-kingslumber-teleport-cheats_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/how-to-use-inspect-element-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/cheat-engine-roblox-kicked-bt-server_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-item-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/fortmartin-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-faces-roblox-catolog_GM431946152.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/link-coin-master_GM406889139.pdfIn PDF document text
    • https://ibelive.com.tw/image/data/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000031d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D5 21956 bytes
SHA-256: 0e501136201fc55253483ae888f2b73b65f7e05d191dd653b84e436a8b29cd74
font_01_sfnt_off000061f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 19264 bytes
SHA-256: f1cb0ea9790fd9eec1381d6ece3e0061b345793659c4b6d6641704be3ef20a74

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