Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913cdb885c77824…

MALICIOUS

PDF

49.0 KB Created: 2021-06-08 10:42:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d83383ab72b34788325e4209e499b21b SHA-1: b50d98c87379e9234f9fd14992485d92e65b2139 SHA-256: c913cdb885c778248c98aaa0fa05d84ec78d2d713ddb47ff88a50ec214a73aec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free Robux' and game hacks. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-robux-ad-banner-game-hack In PDF document text
    • https://www.bmta.co.uk/images/free-roblox-cards-youtube-live_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.bmta.co.uk/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.bmta.co.uk/images/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.bmta.co.uk/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bmta.co.uk/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/soros-roblox-hacks-pastebin_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.bmta.co.uk/images/roblox-got-hacked-2021-video-and-evidence_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/free-robux-no-buying-armanda_GM431946152.pdfIn PDF document text
    • https://www.bmta.co.uk/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E8E 28188 bytes
SHA-256: 3f3b5fee0e09f023b85d648d93ebe509f2fa1071cbdfd72890904bead48ab8a8
font_01_sfnt_off00008e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0A 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off00009c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C96 18416 bytes
SHA-256: 29a70c990ecf7eaf9e31279aaf3532009eba4e71906a6ef613ad3be4a6c49292

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