Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7d39e153b242cd…

MALICIOUS

PDF

34.4 KB Created: 2021-07-07 09:30:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 216ff8f4d865ff27c670cc2411091a1e SHA-1: 0d0e1d2032bc3ff7ee055ea9cdc0002444ff3e00 SHA-256: cd7d39e153b242cd8d23900d1c863e7e3e85b9dcb1529bfcdf186786607a2f44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'game hacks' and 'free generators' for popular mobile games. The primary redirector URL, http://netcdn.tw/app/406889139/coin-master-games-hack-game-hack, is flagged as malicious. This indicates a likely social engineering lure to trick users into visiting malicious sites, potentially for credential harvesting or malware distribution. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a phishing or malware delivery attempt.

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/coin-master-games-hack-game-hack In PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-get-free-robux-on-iphone-6_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/roblox-highschool-2-hack_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-games-roblox-games_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/menu-hacks-kupkake-roblox_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/roblox-hack-genwrator_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/roblox-ghost-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-do-u-speed-hack-in-mm2-roblox_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/robux-prices_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_off0000317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317E 22620 bytes
SHA-256: a225a4efbaa8c69b61682f383f53a3101befafd67da290ad240b56893e718ee2
font_01_sfnt_off000063f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 18264 bytes
SHA-256: c1c21b29a6afb4d06e4d6845aa9afd5500216469eff45eb2d027be7bd9c24dc5

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