Malicious PDF — malware analysis report

Static analysis result for SHA-256 6728c6b45e6fb77b…

MALICIOUS

PDF

34.9 KB Created: 2021-06-19 10:05:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f4df8488c9a5c8cacc7d64843a86fbc1 SHA-1: 2fffa2c09521b260ad915889b096ad44bd52ee84 SHA-256: 6728c6b45e6fb77bc4a87a51dbfcd01de9390d9fbb46a1c8d77d0950ba5b8ac5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game hacks and free items, which is a common social engineering tactic. It embeds a URL that is flagged as a malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious.

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/free-roblox-pumpkin-stencil-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-money-script-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-robux-for-free-on-bowser-instantly_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-how-to-get-hacks_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/proto-hack-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-hacking-admin-commands-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/project-alpha-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/boku-no-roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/fahrzeug-simulator-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/lazyblox-com-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
stream_002_off00002f44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F44 22500 bytes
SHA-256: 0b905bcad3c481c8a83b880cb17e93095cf5f26c9cda3d722d3378e6f6b003f9
font_01_sfnt_off00006197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6197 19772 bytes
SHA-256: 05abbce07cf0857a6073fe3f59cf33345c91048383c068ee0c56fa11b004444a

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