Malicious PDF — malware analysis report

Static analysis result for SHA-256 770786c8a2e63595…

MALICIOUS

PDF

34.5 KB Created: 2021-06-27 09:51:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6e3181252ab96db7096a04213f01dcd1 SHA-1: f6e38811faf57e149905dbc0b19f4586a39b64e2 SHA-256: 770786c8a2e63595a9b7273891d87f7a2285d305abf9a3fcc84c11d6c4823ed1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that lead to pages offering game cheats and virtual currency. The primary URL, http://netcdn.co/app/431946152/roblox-cheats-to-get-2021-robux-2021-game-hack, likely serves as a download or redirection point for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-cheats-to-get-2021-robux-2021-game-hack PDF link annotation
    • https://ezgolfer.com.tw/image/data/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/i-want-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/1-million-robux-for-free_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/como-denunciar-a-un-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/bloxgain-free-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/get-me-free-robux-now_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-using-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-the-marshmallow-head-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-spins-coin-master-hack-2021_GM406889139.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_off00002eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECA 22420 bytes
SHA-256: 5500779484a86a10a516389d2c368931c46560bbc0fd249959686940aa96ca8a
font_01_sfnt_off000060e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E0 19296 bytes
SHA-256: 1b74f1481c586100a0b86cd5affd42753727775b0b3d032187dbefbe7212928a

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