Malicious PDF — malware analysis report

Static analysis result for SHA-256 c537121e1df54e21…

MALICIOUS

PDF

34.9 KB Created: 2021-06-30 11:45:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b0d97278b10b5fe8577606219dd93d7a SHA-1: fbfba118ede7d87d776e136434120761d9dbe97c SHA-256: c537121e1df54e21c493e646887629b012a34304ad83c517f26835bdf5be20c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, disguised as generators for popular games like Roblox and Coin Master. The document body explicitly contains the URL http://netcdn.co/app/431946152/free-roblox-shirt-templates-2021-christmas-game-hack, which is flagged as a malicious redirector. The presence of these links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

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/free-roblox-shirt-templates-2021-christmas-game-hack In PDF document text
    • https://7gking.tw/upload/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/can-you-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-arcane-adventures-hack_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-teleport-hack-jailbreak_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-pet-simulator-hack_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/free-robux-number_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/robux-bot-hack_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-to-get-knvies-in-assassin-roblox-hack_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/how-to-make-your-own-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://7gking.tw/upload/files/robux-for-free-website_GM431946152.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_off00002f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F51 22452 bytes
SHA-256: e550cddbe2f9f1a3d9c8213890b6f3fa62d13f814ff6696f179f15c35cd4df38
font_01_sfnt_off000060da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DA 19880 bytes
SHA-256: 170171e72ed44fe2d1671d198052de416a0c1db0a25c3152879e7d45f71f48b4

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