Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4675d83e2a2c12…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 20:04:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6cac51dfd3a8578bb57beed5d9d4b8c2 SHA-1: 50c56ca2a26b77dc764e270c5b80a028ecf21934 SHA-256: 3a4675d83e2a2c120aee6c56a414fb3cd16222e3c4c9f97d451fea25ef484726
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for free game currency like Robux. The primary malicious URL, http://netcdn.tw/app/431946152/free-robux-com-2021-game-hack, is identified as part of known malicious infrastructure. The document body and embedded URLs reinforce this lure, suggesting an attempt to direct users to potentially harmful websites.

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-com-2021-game-hack In PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-hack-roblox-items-on-to-your-account_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/pastebin-roblox-free-catalog-dominus_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-cards-2021_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-hack-dusk-autinum-islands-roblox_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-cheatengine_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-co_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_off00003023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3023 22948 bytes
SHA-256: a49ac87264e882fc96b978c193f08e78f512181ec6a4b140aa13b02e1da48ae8
font_01_sfnt_off000063cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CB 19380 bytes
SHA-256: e4a3050f3e501d111e2505792e6fe17b213487e8f387ded0c09bd9d126917491

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