Malicious PDF — malware analysis report

Static analysis result for SHA-256 faff0d8844ab5dcb…

MALICIOUS

PDF

33.4 KB Created: 2021-06-27 14:19:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 87a3c880b7e24c4f6cf64c968cda1c97 SHA-1: a55983b3886616dd4b9f6bb0be90e1475f56b563 SHA-256: faff0d8844ab5dcb7ff0ca03bed1a7d5af81a7a36872969f0abdb266039353fb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and text that lure users with promises of free in-game currency for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to download a secondary payload. No scripts were extracted from this sample, but the overall pattern is consistent with a phishing or scam document designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/generate-robux-for-free-with-no-downloading-games-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-backpack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-version-free-download_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-without-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-1m-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/hack-de-velocidad-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-2021-android_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/pokemon-brick-bronze-roblox-where-to-find-exp-share-free_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-download-roblox-robux-hack_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_off00002a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A89 21816 bytes
SHA-256: 2b893b6eee012df23b049bfa64e0d143d7a08c2feb25331d862d7799b024e005
font_01_sfnt_off00005a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A93 20144 bytes
SHA-256: 6e51ff0ee22ebcc67bc3e6b1069edf9d4df1cca0511c0d65305d066d17fddee8

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