Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc84efb4f69f854…

MALICIOUS

PDF

33.1 KB Created: 2021-07-06 12:49:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e1924fa734bb35c19c0cfad31698c7e0 SHA-1: 1a6531d6bc37f5cc518d083ae23cafaf1247b6ad SHA-256: 3fc84efb4f69f854f9105fc621f5378babf8d77a2e91eb49df34d584acc69bc8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free generator / game hack' which links to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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/get-free-robux-today-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/is-it-possible-to-get-banned-for-cheating-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-game-no-password_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-use-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/vipervenom-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/como-hackear-roblox-apk-mediafire-para-ir-mas-rapido_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hacks-para-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/best-apocalypse-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-10-website_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-redeem-virtual-codes-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/musical-chair-cheat-roblox_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_off00002cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBE 21364 bytes
SHA-256: 09891dcc1a4fe7b9878703585885164dd4ef1a53110c5020f8d6a32f757fdac5
font_01_sfnt_off00005b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8D 19172 bytes
SHA-256: 3fdd240faf6e1407f7e3e305b0db49c456ea6d47955c0aeac931bfd374d9ce8c

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