Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c0d9b40ae18f5d…

MALICIOUS

PDF

34.0 KB Created: 2021-07-08 14:51:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e3928ec1b484edccb9fbebf2b444227d SHA-1: e77f5a316cca5de988b83785d2c10e2076e09053 SHA-256: 71c0d9b40ae18f5d8bac538bdf449bddf1cdf347d1f2d5a40e745e2097ca6eea
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are SEO-optimized pages offering "hacks" or "free currency" for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic indicates a pattern of hosting numerous deceptive links. The document body itself contains a primary URL that appears to be a direct download or exploit link.

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.tw/app/406889139/hack-coin-master-free-game-hack PDF link annotation
    • http://www.ma-plast.hr/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-get-free-robux-2021-august_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-do-i-get-robux-for-free-without-paying-dollars_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/how-to-get-free-hats-for-free-no-inspect-roblox_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/roblox-groups-with-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/best-free-roblox-explits_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/como-ser-un-hacker-en-house-of-keys-roblox_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/robux-miner_GM431946152.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_off00003119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3119 22328 bytes
SHA-256: cfae1fb4d77136e01cbe4570174acff4a1057c242f614d40b1d7074d75b7d02a
font_01_sfnt_off0000629d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 18168 bytes
SHA-256: be72a1914a99b846651b156c672e0768d1f742f579973333786d0ab12deac364

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