Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f75aa31d8cbaf2e…

MALICIOUS

PDF

34.6 KB Created: 2021-06-29 01:43:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 34e302bf9f8de9150124b27e2dec133b SHA-1: 26dfa9e6d67ae5b69fdc799668f4e64f8a2f2892 SHA-256: 8f75aa31d8cbaf2e54aa528045550bcd55160e6ede37162f5f6cf2de898944ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common lure of free in-game currency to trick users into clicking malicious links. The document contains multiple embedded URLs, including a primary redirector at http://netcdn.co/app/431946152/roblox-obby-gives-you-robux-for-free-no-password-required-game-hack, which is flagged as malicious. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or scam 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/roblox-obby-gives-you-robux-for-free-no-password-required-game-hack In PDF document text
    • http://jjpremiers.com/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • https://www.jjpremiers.com/files/tiktok-free-or-not_GM835599320.pdfIn PDF document text
    • http://jjpremiers.com/files/free-robux-2021-no-wait-time-not-fake-instant-february_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/roblox-bc-for-free_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://www.jjpremiers.com/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.jjpremiers.com/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.jjpremiers.com/files/robux-hack-real-no-survey_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://jjpremiers.com/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/roblox-free-body-bundle_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • http://jjpremiers.com/files/rbx-free-robux_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_off00002ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED4 21996 bytes
SHA-256: 5dba7f19829d9d72d3d1acea9bfbfd9d6815a17460e7b69e55ba3bf66bf4b44b
font_01_sfnt_off00005f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F70 20028 bytes
SHA-256: 7ed910095305c38e867662ff99619dcf7b7ddb72ed8188fb7c274b7c242b56db

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