Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbca5ef59a8dd09…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 15:04:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 109045bdace5eea7426dd2482a0848f6 SHA-1: 507664f14df5243f14401be489f54ac80362ca71 SHA-256: ffbca5ef59a8dd090d557492448477f08e85ce90f9e9f7b6cd7ee7f6b1e31643
102 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a PDF link farm, suggesting an attempt to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a download button lure further supports the malicious intent.

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-2021-free-spins-link-2021-game-hack
    • http://solidkom.ch/images/easy-way-to-get-free-robux_GM431946152.pdf
    • http://solidkom.ch/images/free-robux-com-no-verification_GM431946152.pdf
    • http://solidkom.ch/images/coin-master-32-mod-hack-apk-download_GM406889139.pdf
    • http://solidkom.ch/images/free-coin-master-coins_GM406889139.pdf
    • http://solidkom.ch/images/mcpe-master-hack-coins_GM406889139.pdf
    • http://solidkom.ch/images/coin-master-free-spins-ios-app_GM406889139.pdf
    • http://solidkom.ch/images/how-to-get-free-roblox_GM431946152.pdf
    • http://solidkom.ch/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://solidkom.ch/images/coin-master-claim-free-spins_GM406889139.pdf
    • http://solidkom.ch/images/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • http://solidkom.ch/images/easy-robux-hack_GM431946152.pdf
    • http://solidkom.ch/images/minecraft-life-hacks_GM479516143.pdf
    • http://solidkom.ch/images/blox-rewards_GM431946152.pdf
    • http://solidkom.ch/images/coin-master-hack-apk-35-13_GM406889139.pdf
    • http://solidkom.ch/images/get-free-food-in-coin-master_GM406889139.pdf
    • http://solidkom.ch/images/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://solidkom.ch/images/free-robux-discord-servers_GM431946152.pdf
    • http://solidkom.ch/images/roblox-free-robux-hack_GM431946152.pdf
    • http://solidkom.ch/images/today-coin-master-free-coins-link_GM406889139.pdf
    • http://solidkom.ch/images/how-to-get-20210-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000479f.bin
ad0099dc138cac46f8420f87e198510121434a250115088ecb605a69804bb34b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479F 25328 bytes
font_01_sfnt_off000081f0.bin
b370a5eafdfb7958c61f4fc883d4c28be8b0b06276da4480d394e4923f22f18f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F0 18456 bytes

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