Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e7ac2c605a9c75…

MALICIOUS

PDF

35.1 KB Created: 2021-06-22 10:50:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 533547bf4393d4502be5cce3dea135d3 SHA-1: cdb8b211958b9dd1faf874a2b952e513d24fb81d SHA-256: 63e7ac2c605a9c751ca0235ef3f2b1b27a8508b8751bd11a9876e77c5c5af649
102 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which are presented as 'hacks' or 'cheats' for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly flagged this PDF as malicious. The primary goal appears to be directing users to download potentially harmful files or visit malicious websites.

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-adopt-and-raise-a-baby-hack-game-hack
    • https://aits.co.id/ckfinder/userfiles/files/easy-robux_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-pe-free-download-ios_GM479516143.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/robux-free-robux_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-to-hack-coin-master-ios-2021_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-claim-free-spins_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/promo-codes-roblox-robux-free_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/71-free-robux_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/coin-hackhub-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/how-many-levels-are-there-in-coin-master_GM406889139.pdf
    • https://aits.co.id/ckfinder/userfiles/files/pokemon-go-free-vs-pro_GM1094591345.pdf
    • https://aits.co.id/ckfinder/userfiles/files/cheat-engine-roblox-infinite-health_GM431946152.pdf
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-here_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030b6.bin
7d24873abf49fc828848a5b1ccf7128d7457b798cb44a2192130e781f6d8f409
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30B6 22560 bytes
font_01_sfnt_off000062cd.bin
5955b6cb2dabd0acdd94a511f8b1c6ae4eac20ce3ef09edf4a94ef2a963c4461
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CD 19408 bytes