Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8728152090bbd9…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 12:14:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 08c34b5980b99f0db3a9cb2961e6b249 SHA-1: 7ab8423888ecd45323a83cd21e98c7053ca25f07 SHA-256: 3a8728152090bbd990d2071d4db208681cc4d878dc3606d0c1ebd2587fbc91ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux' or game hacks. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms these links point to known malicious infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to potentially malicious sites for further exploitation or phishing.

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-no-survey-or-human-verification-game-hack In PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/www-free-robux-org_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-for-samsung_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-titanic-script-hack_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-hack-roblox-defenders-of-robloxia_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/roblox-cheat-engine-table-and-bypass-2021_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/tiktok-free-recharge-500_GM835599320.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spins-hack-download_GM406889139.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_off00003016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3016 22904 bytes
SHA-256: 115f8ea0d2a8ff589bdd79eb94829b8587668b15629b4fd38b4e3bce587d98f3
font_01_sfnt_off00006320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 19628 bytes
SHA-256: cdea958d27f31e1bb93a151c26d135a3dbedf9ed5520af1903eb9fa34a77bfdd

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