Malicious PDF — malware analysis report

Static analysis result for SHA-256 c313071304306d52…

MALICIOUS

PDF

35.8 KB Created: 2021-06-29 23:26:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 89dc98284419a66194926bd91f64da90 SHA-1: 46101d3b41d49ec9ee120417b2fb1b4001ae6d24 SHA-256: c313071304306d528f2ad0a2e4e45114a8723f76efbc7e24be02254eaa6467b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game hacks and free generators, with a critical heuristic firing for a malicious redirector link. The embedded URL directs to a known malicious redirector, indicating an attempt to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristics suggest a malicious workflow designed to lead users to malicious 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 http://netcdn.co/app/431946152/quiz-for-free-robux-game-hack In PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-link-hack_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/roblox-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-wearable-wings-roblox_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/cute-roblox-clothes-free_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/hack-for-da-hood-roblox_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/olzer-free-robux_GM431946152.pdfIn PDF document text
    • http://rt9.rspo.org/ckfinder/userfiles/files/free-games-to-get-robux_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_off00003296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3296 23228 bytes
SHA-256: 16fa8096049bc3464400fd1c579d04b52057f7e1a50408260105bdd2f76beb01
font_01_sfnt_off000066dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DC 19076 bytes
SHA-256: 8323bcca3f52d315691cde5dd4654bd75357e9378c80fd6a3a99c7d5248673f8

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