Malicious PDF — malware analysis report

Static analysis result for SHA-256 53527a668d9bcc1e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 06:54:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89f2b94c842f9e8358e02bc2d9082224 SHA-1: 7fcadca3b8fd3d7cc28725d7e9f122617fba35ac SHA-256: 53527a668d9bcc1ecec483f637b8716ef638399823970919a8513d0b9cc60f8a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The heuristic firings indicate that the document is designed as a lure to a known malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to drive users to potentially harmful content or further malware downloads.

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-not-fake-game-hack In PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-how-to-get-free-robux-in-seconds-2021_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-bobux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-jailbreak-cheat-money_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-hack-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/hacking-on-alt-account-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/robux-hack-without-human-verify_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-roblox-account-generator_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_off0000324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324C 22708 bytes
SHA-256: 31d4d54f3b4663893b1fa4d0331f06185c2516587b72a3810e56b33359737d01
font_01_sfnt_off0000652a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652A 18992 bytes
SHA-256: e4ac39d57ff956450bb8dd48df15acc1078399c4d14e18067568ebfa6ae85f6b

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