Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9caad72f840371…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 13:02:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 175305a154ece1a003c995bdf37e6355 SHA-1: 46fa5b505a0af2c7fd4b8d769af7a11e626a8e83 SHA-256: ea9caad72f8403715e23983879e68953514a1490fe83a169ac703a39dc67ee1d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on domains related to 'hacks' and 'cheats' for games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful content or downloads. The ML classifier also strongly flagged this PDF as malicious.

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/coin-master-hack-https-coinms-net-game-hack
    • https://www.efeskbb.com/upload/content/files/coin-master-hacks-for-android_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/download-coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/coin-master-cheats-2021_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/how-to-hack-someone-on-roblox_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/coin-master-free-link-today_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/coin-master-hack-ios-download-2021_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/free-robux-images_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/official-coin-master-free-spins_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/coinmaster-hack_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/coin-master-hack-mod-apk-download_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/free-robux-hack-2021_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/robux-hack-free-robux_GM431946152.pdf
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/coin-master-15-free-spin-link-today_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/hacks-master-coin_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/best-coin-master-hack_GM406889139.pdf
    • https://www.efeskbb.com/upload/content/files/coin-master-free-link-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a86.bin
f6d989f6fc863f98600c823a0da5186a18891068955ccb7f4bbaa722c49ee8f7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A86 23808 bytes
font_01_sfnt_off00008073.bin
98ac4e66809d5f1f5b8246c3389f99af71150df64b93ee4f4ebb1a2fd2e53783
pdf-font-stream PDF embedded font (sfnt) at offset 0x8073 18152 bytes