Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea20a9292934eafb…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 21:44:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5d1c28d3db2290eda6f18729c25f3bfa SHA-1: 119de073bc582e752203136649a0beacd95abad2 SHA-256: ea20a9292934eafb05e10e7aa2f7c069c6ff96be722c51c4b86170f188ed1451
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, possibly related to game hacks or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/cmaster-club-coin-master-hack-game-hack
    • http://nod74.ru/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://nod74.ru/images/minecraft-building-hacks_GM479516143.pdf
    • http://nod74.ru/images/coin-master-app-for-free-spins_GM406889139.pdf
    • http://nod74.ru/images/free-robux-generator-without-verification_GM431946152.pdf
    • http://nod74.ru/images/coin-master-free-gold-cards-link-2021_GM406889139.pdf
    • http://nod74.ru/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://nod74.ru/images/minecraft-pe-free-download-android_GM479516143.pdf
    • http://nod74.ru/images/free-robux-scam_GM431946152.pdf
    • http://nod74.ru/images/coin-master-free-spins-link-iphone_GM406889139.pdf
    • http://nod74.ru/images/game-toolbox_GM479516143.pdf
    • http://nod74.ru/images/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://nod74.ru/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://nod74.ru/images/coin-master-free-soins_GM406889139.pdf
    • http://nod74.ru/images/to-get-free-robux_GM431946152.pdf
    • http://nod74.ru/images/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://nod74.ru/images/free-robux-without-downloading-apps_GM431946152.pdf
    • http://nod74.ru/images/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://nod74.ru/images/free-roblox-scripts_GM431946152.pdf
    • http://nod74.ru/images/coin-master-game-hack-apk_GM406889139.pdf
    • http://nod74.ru/images/roblox-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048dc.bin
6f174212e4cbb4242c9d8bac352dc95f1356da7024f04b2d63894ec119e6ec26		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DC 31080 bytes
font_01_sfnt_off00008889.bin
770ec93328e1c8b307bcbfea9c0f1da9416090f0471e9d56bc95ec3568114428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8889 18348 bytes

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