Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a21926d1ced90b…

MALICIOUS

PDF

46.9 KB Created: 2021-05-12 13:55:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cf4c2e42d6fbb4d5b8a4597892201d1c SHA-1: 71ed950ef14647cc7af69cc5c1944d7151519bd3 SHA-256: 81a21926d1ced90b1af2c72bd0ef003ed661ad093876e22045458f20e70bb116
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a link farm, pointing to external resources promising game-related cheats. The primary URL, https://netcdn.xyz/app/431946152/robux-generator-2021-game-hack, suggests a lure for free in-game currency. The presence of a 'download button' heuristic further supports the intent to trick users into downloading content. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/robux-generator-2021-game-hack
    • http://www.e-lysis.com/images/apps-that-give-you-free-robux_GM431946152.pdf
    • http://www.e-lysis.com/images/coin-master-reward-link_GM406889139.pdf
    • http://www.e-lysis.com/images/free-2021-robux_GM431946152.pdf
    • http://www.e-lysis.com/images/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • http://www.e-lysis.com/images/coin-master-hack-no-human-verification_GM406889139.pdf
    • http://www.e-lysis.com/images/free-spins-coin-master-links_GM406889139.pdf
    • http://www.e-lysis.com/images/get-free-spins-on-coin-master_GM406889139.pdf
    • http://www.e-lysis.com/images/google-how-do-you-get-robux_GM431946152.pdf
    • http://www.e-lysis.com/images/coin-master-free-spins-coins_GM406889139.pdf
    • http://www.e-lysis.com/images/roblox-lawsuit_GM431946152.pdf
    • http://www.e-lysis.com/images/free-coins-coin-master-hack_GM406889139.pdf
    • http://www.e-lysis.com/images/coin-master-32-android-mod-hack-apk-download_GM406889139.pdf
    • http://www.e-lysis.com/images/get-free-spins-coin-master-link_GM406889139.pdf
    • http://www.e-lysis.com/images/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • http://www.e-lysis.com/images/free-coin-master-hack-no-verification_GM406889139.pdf
    • http://www.e-lysis.com/images/how-to-hack-roblox_GM431946152.pdf
    • http://www.e-lysis.com/images/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://www.e-lysis.com/images/arsenal-hacks-roblox_GM431946152.pdf
    • http://www.e-lysis.com/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdf
    • http://www.e-lysis.com/images/coin-master-strategy_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b7d.bin
391b3b0bea05f26e51606c4c6cebc47668bfc30b6efb920d82fa83603d60e71c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7D 28124 bytes
font_01_sfnt_off00008a11.bin
77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A11 2832 bytes
font_02_sfnt_off000093c2.bin
54c01f4636823bab04ead8b034b7e6a977e3ade15c99bbf56eda2a9f45b45d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C2 18584 bytes

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