Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33f1e3b2ffc0094…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 17:33:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0fda06bc4678a44fb02b1b1ae52243ea SHA-1: fdf9b7ee60ad87a05b2b0f6dfb1a9199cad12dcd SHA-256: f33f1e3b2ffc0094477b1dfe2aed801679fbabd8a5cfffc2e7fd15c82c2049fe
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially garbled, contains references to 'free spins' and 'Coin Master', indicating a potential lure for game-related cheats or scams.

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/how-to-get-daily-free-spins-on-coin-master-game-hack
    • http://bwharrisalumniusa.org/images/coin-master-free-stars_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/coin-master-free-coins-generator_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/www-bandicam-com-free-robux_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/free-account-roblox-with-robux_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/how-to-get-free-roblox-premium_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/minecraft-rtx-download-free_GM479516143.pdf
    • http://bwharrisalumniusa.org/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/free-minecraft-svg-cutting-files_GM479516143.pdf
    • http://bwharrisalumniusa.org/images/coin-master-ids-for-free-spins_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/coin-master-free-spins-android_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/roblox-troll-outfits-free_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/coin-master-free-daily-spins_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • http://bwharrisalumniusa.org/images/free-robux-come_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/coin-master-hack-https-coinms-net_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/hacked-roblox-game_GM431946152.pdf
    • http://bwharrisalumniusa.org/images/free-coins-on-coin-master-generator_GM406889139.pdf
    • http://bwharrisalumniusa.org/images/minecraft-auto-miner-hack_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d1.bin
2328474263c6bea80531cbaf7d1ddfbcf0b60b42db3a9383371d74d1f196abfb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D1 24160 bytes
font_01_sfnt_off000080d6.bin
39c175e238be4f7921b046c78c06fe9a00b09eca58e402890515fe03c626abe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D6 18472 bytes

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