Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c9c322a6f8abdb…

MALICIOUS

PDF

34.3 KB Created: 2021-06-30 10:02:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 887fdbb9fe338762f3fc2d3411d8cb14 SHA-1: 645565969dfb32bb324a53c92c91a357ef3f5803 SHA-256: 27c9c322a6f8abdb9241ba2f54e5fe2afab9600eac4afb55d4a3e5b6ca964790
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as offers for game hacks and currency. The primary lure URL is http://netcdn.co/app/431946152/roblox-robux-hack-reddit-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow designed to lead users to potentially harmful content.

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.co/app/431946152/roblox-robux-hack-reddit-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/client-minecraft_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tiktok-free-no-download_GM835599320.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-hack-2021-download_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/cheat-buddy-esp-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/cheat-roblox-kick-players_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-voucher-codes_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_off00002f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3B 22128 bytes
SHA-256: c0992a33a27c9ebb60b19f92b8e67498c116d80d683afe2bdfcd2cdd88950b22
font_01_sfnt_off0000604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 19196 bytes
SHA-256: 870101cbc716b09ff9d52c620ce3a0f52ca0a95570c5268e0455b5ad67edca6a

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