Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d82bd4febed373…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 01:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f2d880748f4ea505f7ddeaa464213e7e SHA-1: 8f9e69a8d8a3738141343cd84ebee4206216ca5f SHA-256: a8d82bd4febed3730ddc2451db1cfaaeb4b85a9b77e2aec3d6ff3807417da6c5
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, disguised as generators for free game currency and hacks. The primary lure URL is http://netcdn.tw/app/431946152/best-free-robux-sites-game-hack, which is designed to trick users into clicking through to potentially harmful content. The document body and embedded URLs reinforce this theme of free game-related resources, a common social engineering tactic.

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/best-free-robux-sites-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/what-to-do-if-my-robux-is-hacked_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-with-guddinfo_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/all-roblox-gamepass-free_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
stream_002_off00002efa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EFA 23264 bytes
SHA-256: af28ddcf1504215de79a608ce75525d8970f25025a079370578923a779522b25
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 18940 bytes
SHA-256: 0fcca8ab5ad8a611b3094f34fe9520b7837fa4f9a56d425283eb336eaeb68af3

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