Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec83273091069e8b…

MALICIOUS

PDF

42.4 KB Created: 2021-05-14 23:01:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3df9ef8b208942334bd2883d13ba0022 SHA-1: 7478c8328288d0a068540378ebb253205b700e75 SHA-256: ec83273091069e8b37327cee5a204a97b50d29ae9658710025e63f036ca0c4ef
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, suggesting it is designed to redirect users to external sites for downloading content. The document body, though partially corrupted, indicates lures related to game cheats and free currency, aligning with common phishing and malware distribution tactics. 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/431946152/roblox-promo-codes-free-robux-game-hack
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-gold-cards-hack-2021_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/robux-generator_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-spins-on-coin-master-game_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-roebucks-no-human-verification_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-shield_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/robux-com-free_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-roblox-scripts_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-free-spins-twitter_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-robux-android_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-official-fan-page_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/80-free-spins-coin-master_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/ro-ghoul-script_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/coin-master-hack-download-android_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/websites-to-get-free-robux_GM431946152.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-mods-for-coin-master_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-coins-coin-master-blog_GM406889139.pdf
    • http://trust.edu.vn/wp-content/uploads/imagesfiles/free-spin-coin-master-new-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a19.bin
242f960c497e19842a23179f4479e349b167d9a736539ae05d2d019af06dcd98
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A19 24428 bytes
font_01_sfnt_off0000823a.bin
3ed324e585500d41944ebd93500991c566830021fec9c5a8323b790459c3443f
pdf-font-stream PDF embedded font (sfnt) at offset 0x823A 18676 bytes