Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6681b9982a8098…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 22:06:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f3537d02505181be1db22d58760cdf33 SHA-1: 29ac7f8fbac241773022eb58413a7b82872624c0 SHA-256: fb6681b9982a80987f67e072b74478cd1e90f868aa1940ef66b8d29ea0d9c718
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains lures for game hacks and free currency, directing users to a malicious redirector URL. The ML classifier strongly indicated maliciousness, and the document body confirms the lure content. While no scripts were extracted, the embedded URLs and the nature of the lure suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/roblox-script-hack-game-hack In PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-infinite-robux-by-hacking_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-hack-a-server-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-cool-pants-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-2021-working_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-hack-de-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-free-robux-on-samsung_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-bacon-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-moderators_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_off00002fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEE 21980 bytes
SHA-256: ad1eaab283939ee8bd707a681ffc244b2e3ab7135b72db49d3896677a544bcd2
font_01_sfnt_off0000607a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 19056 bytes
SHA-256: bb76e7a39623e8e346641af63eba4df40d7f195b132658733982612819f2f46a

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