Malicious PDF — malware analysis report

Static analysis result for SHA-256 0512b81e08ede6f9…

MALICIOUS

PDF

50.9 KB Created: 2021-06-10 23:04:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6493abbaf6367c966d31478be7a7755f SHA-1: c1e19e0cb96f175ade7267decead0e22458b7daa SHA-256: 0512b81e08ede6f9638ef71e012a56b6e1deffb2fe78ea316af36943f8a4b035
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-generator-for-laptop-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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-generator-for-laptop-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/cheat-engine-64-free-download-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-scripts-for-games-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-70-spin-link_GM406889139.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_off00005441.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5441 30664 bytes
SHA-256: d3df0c15a789792109277f8c6bb7801463b76a7ce8996c54062098f0f771d7c8
font_01_sfnt_off000099be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99BE 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000a3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A9 18524 bytes
SHA-256: 28821f05f471078ae9feac0a219cf7bfe31be1a363c01c986408b18f0995b5c7

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