Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf0421d5289fcd6…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 16:43:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2d2d123a2b6b906e8e5a4092d7990139 SHA-1: accd0253cb2cc3c837e0de1f21f6ccd67fbb319c SHA-256: caf0421d5289fcd625578f5848645aa95dd77af72f5226fcfad8a791a18336d5
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as links to game-related content such as free Robux or Coin Master spins. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to drive traffic to phishing or malware distribution sites. The presence of a 'download button' lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-roblox-dominus-november-2021-game-hack
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-minecraft-realms-to-join_GM479516143.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-vip-server-roblox_GM431946152.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-robux-reddit_GM431946152.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/coin-master-apk_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-roblox-money_GM431946152.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/minecraft-for-ipad-free_GM479516143.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-promo-codes-for-coin-master_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/minecraft-pe-apk_GM479516143.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/coin-master-hack-mod-apk-android-1_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-can-i-play-minecraft-for-free_GM479516143.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/minecraft-hacks-115-2_GM479516143.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/100-free-spins-for-coin-master_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/hack-coin-master-without-verification_GM406889139.pdf
    • https://barokahutama.co.id/ckfinder/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052dc.bin
b0e15d66c56f2c6fd3fc17d8590c41416a12eaf01dfa22a1750983fabfe0990f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DC 25168 bytes
font_01_sfnt_off00008c08.bin
d9ee607049b6037a463ad9785636dd55ef88e3906d52c7faccebd2b1feedc2f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C08 19152 bytes

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