Malicious PDF — malware analysis report

Static analysis result for SHA-256 557af1f5163b25eb…

MALICIOUS

PDF

44.6 KB Created: 2021-05-15 10:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6bf1432057a6d7e7a4ebc21416424c83 SHA-1: ecdee1de5036f569995cdcba3ca562634f4f95d4 SHA-256: 557af1f5163b25ebceabf1a350f22e4b2768a6903a2ba70f9dea78225068554e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious website, likely to lure users into downloading malware or engaging in scams. The document body and heuristics indicate a lure related to game hacks and free currency, specifically mentioning 'Robux'. While no scripts were directly extracted, the presence of malicious redirector links and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content.

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-by-playing-games-game-hack In PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/robux-games_GM431946152.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.pps.uin-suka.ac.id/repository/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C42 26472 bytes
SHA-256: 797705bbe748b4ee8e21f538fe9e58de6e4b7edd9bb9a5add59ed6de7b28f4df
font_01_sfnt_off0000883f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883F 19588 bytes
SHA-256: 4959be52701d88ef79c98b835575558ad206ad5c377459138293e90af74f97c3

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