Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c417e938aaf29…

MALICIOUS

PDF

43.2 KB Created: 2021-05-14 01:49:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 14eaa5d232eea6e4098941d119a6cb1f SHA-1: a8390bd69a01fa7fb2966e9d794864daf7d367ec SHA-256: d91c417e938aaf292e44957109f559b0772168b5f155b7fb0b67a824b6caa7af
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and a primary redirector URL that are associated with malicious activity, specifically luring users with game-related content. The heuristic firings indicate that the PDF is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple malicious URLs and the nature of the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/coin-master-free-spins-link-2021-twitter-game-hack In PDF document text
    • http://leigraphics.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-haktuts_GM406889139.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_003_off00004a68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A68 25968 bytes
SHA-256: 087e9dcead019427ccac14b70e485565e9e1003bf30f6d70882b3d8b7009357f
font_01_sfnt_off0000858d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858D 18624 bytes
SHA-256: 2a222fa7736cc624854c57ea31ed5889d6e2ab16aa32c0d7c4a050f5b2ef3bb0

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