Malicious PDF — malware analysis report

Static analysis result for SHA-256 8003bab18fbdfbf7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 20:42:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: db48f5e0585937f962c48d839ea6b4a7 SHA-1: 30e8ebd31ac9d989f49d02e3d14b82cdf77ff4a9 SHA-256: 8003bab18fbdfbf71a201ac3b82201c4dd373f0c3121d190baef392af6f3376f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and embedded text promoting 'free Robux' and 'game hacks', directly leading to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate a lure for free game currency. The primary IOC is the malicious redirector URL used in the lure.

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/how-to-get-free-robux-without-verification-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-robux-hack-pc_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/robux-hack-in-game_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-cbro-cheat-spots_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/pokemon-go-free-trainer-codes_GM1094591345.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/shake-hack-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-robux-on-roblox-for-free-on-pc_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-cheats-android-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-verification_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-bee-swarm-honey-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-exe-editor-cheat-engine_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-test-roblox-shirts-for-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-draw-2-roblox-rules_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-no-survey_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
font_00_sfnt_off00002fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA9 22140 bytes
SHA-256: a3aa1b0c299723d00849d29249ac859ae56aa618b485811d58a9ce6799bcdfaa
font_01_sfnt_off000060c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C7 19604 bytes
SHA-256: 58b409e880d8c8c8f611c8851265b785a46b2984af904f55916f4ac6f211fe18

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