Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a8fc59e2be596a…

MALICIOUS

PDF

45.9 KB Created: 2021-05-15 13:33:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d64f4627f8121058f3fccf7c3fd32216 SHA-1: 093c56a48d0307c8793572e94789311b362424e8 SHA-256: 36a8fc59e2be596a732a607983932f22b87852e4f4af6643f1e558328ac9c9a6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free Robux' and 'game hacks'. The embedded URL https://netcdn.xyz/app/431946152/free-robux-no-human-verify-game-hack is a critical finding, indicating a lure to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to harmful sites.

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 https://netcdn.xyz/app/431946152/free-robux-no-human-verify-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-g_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-hack-a-roblox-account-2021_GM431946152.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-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-pics_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3A 29032 bytes
SHA-256: 335a641138b5a6be3f3dc75c157eed4a82c5239436e0e2930dc95db4b31f2607
font_01_sfnt_off00008f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F86 18936 bytes
SHA-256: 1a7af96eb5386f0345b1dbf35dc45129c86900916c4bfc8bfbf0065f0a01c751

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