Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87b9e74dd36996f…

MALICIOUS

PDF

48.5 KB Created: 2021-05-15 08:13:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f85b63c967faf920f2812955084d688e SHA-1: c870dde2ac596536a346f6b232b24ef4b831db3e SHA-256: c87b9e74dd36996f6e8ec8935ba42653ebedd6a1abd67a9bbe7b11e9971f0f92
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a PDF link farm, pointing to SEO-optimized pages related to game hacks and free spins. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure suggests an attempt to redirect users to potentially malicious or ad-filled websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-bit-ly-game-hack
    • http://ofthalmiatrosthess.gr/images/coin-master-hacks-free-spins_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/get-more-free-spins-on-coin-master_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/pasos-para-hackear-coins-master_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/roblox-hack-game_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/free-daily-spins-coin-master_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/coin-master-free-daily-spins_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/free-robux-only-username_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/roblox-com-redeem_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/daily-coin-master-free-spins_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/free-roblox-followers_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/coin-master-free-spins-link-facebook_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/free-robux-for-kids_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/coin-master-app-free-download_GM406889139.pdf
    • http://ofthalmiatrosthess.gr/images/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/how-to-actually-get-free-robux_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/free-robux-obby_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/free-robux-hack-no-verification_GM431946152.pdf
    • http://ofthalmiatrosthess.gr/images/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdf
    • http://ofthalmiatrosthess.gr/images/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a07.bin
6978dfa50aba45ddc710359204297896c4d7d46d415da8dd5598a4e1d8a3e7df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A07 31072 bytes
font_01_sfnt_off00008ea9.bin
c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA9 3560 bytes
font_02_sfnt_off00009b2f.bin
30193a21741cc5402413da2ce8c3dbb562d342d001498cd3d21d10b4bea75843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2F 18280 bytes

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