Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d4ded5a597d30…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 09:34:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 18fc043686c73a1eaa0ab8e8bb4569d4 SHA-1: fc7eee5e86b7b892846dbeb850494ca3c17cf11c SHA-256: 635d4ded5a597d3049198cd3a8daee28159f82ab9575fb398d3816f97625ee18
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for Roblox. The document body and heuristics indicate a lure to trick users into visiting these malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links within the document.

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/how-to-create-your-own-roblox-hack-script-game-hack In PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-5-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-roblox-no2-copy_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-do-i-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/download-roblox-for-free-on-mac_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-without-verificaton_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-the-pizzeria-rp-remastered-infinite-coins-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/bloxburg-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-ultimate-driving-trucker-money-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/hacks-for-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/cheat-engine-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-clothes-on-roblox-2021-mobile_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/20210-robux-for-free_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_off00002f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9A 22440 bytes
SHA-256: 510ffabe5073f934d242cf949181ba6b235e32910927032f47e1fd8a798af464
font_01_sfnt_off00006158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6158 19524 bytes
SHA-256: 101fa5496375a9bf1d07356b6fb69e8003b8e670d381c9fd2b37e13f48b22395

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