Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ec4c0d6432bbc3…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 23:42:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb3fbe1929e46bd9cbd9b226a48c6c0e SHA-1: 746ee7d597f170d2ad885ccea169b95d7f8084d7 SHA-256: 90ec4c0d6432bbc31697e92f90204868c5f7fc589582ab0d22bf422377eb7a6f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, forming a link farm related to free in-game items and currency. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a phishing or malware distribution attempt. No scripts were extracted, but the document structure and embedded URLs point to a lure for users seeking virtual goods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-spins-on-coin-master-game-game-hack
    • http://cofys.nl/images/claim-free-robux_GM431946152.pdf
    • http://cofys.nl/images/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://cofys.nl/images/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • http://cofys.nl/images/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://cofys.nl/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://cofys.nl/images/oprewards-com-earn_GM431946152.pdf
    • http://cofys.nl/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://cofys.nl/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://cofys.nl/images/free-roblox-shirt-templates-2021_GM431946152.pdf
    • http://cofys.nl/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdf
    • http://cofys.nl/images/coin-master-spin-link-2021_GM406889139.pdf
    • http://cofys.nl/images/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://cofys.nl/images/coin-master-free-link-spin_GM406889139.pdf
    • http://cofys.nl/images/roblox-robux-codes-2021_GM431946152.pdf
    • http://cofys.nl/images/how-to-get-free-robux-without-offers_GM431946152.pdf
    • http://cofys.nl/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdf
    • http://cofys.nl/images/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://cofys.nl/images/60-free-spins-on-coin-master_GM406889139.pdf
    • http://cofys.nl/images/hack-coin-master-free_GM406889139.pdf
    • http://cofys.nl/images/free-robux-com-real_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c9d.bin
11bd0d0612232ab7a0cfa6e6c25b6593460b8c44d1a4d2bcfc664de179429e2c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C9D 24892 bytes
font_01_sfnt_off00008580.bin
b1f30c98449655e0c119849c00bf29bb9bd656252beb56b2567f3adea4b6d957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8580 18148 bytes

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