Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ffec556e27dfe6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 15:31:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-07-01
MD5: d349c9971130310f1d946cb00e992dea SHA-1: 518d624f0593717fa5f462ba1ef221f33659217f SHA-256: a4ffec556e27dfe67614d5ab6e4ee1b0a8405db5d8fdc92acad35d4781064f26
160 Risk Score

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/406889139/free-coins-for-coin-master-game-hack In PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-hat-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-online-hack-for-free_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/blacksburg-bloxburg-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-admin-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-roblox-game-advertising_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-studio-free-games_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/pokemon-go-free-walk-android_GM1094591345.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/pastebin-roblox-free-gamepass_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/promo-codes-for-free-stuff-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (stream_002_off000034ff.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34FF 23320 bytes
SHA-256: b9ff6bf681e3ca24103fca111aa29e11a1f902451ca7c8711ff2f98550ed35cd
font_01_sfnt_off0000693d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x693D 17996 bytes
SHA-256: db592684bbdaaeb7647633841870edbd5981f70e843d3403859f62ceb8e0c83d