Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bba477e8b8d1b01…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 20:32:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 63d2d4d7b314f337b16a466ee867f418 SHA-1: 959d31454711ad5986e0eaa11d5ab4f0a4894fe3 SHA-256: 7bba477e8b8d1b0198d5699516973035e3bfb6e05c37ecb1bbc8c8b3354db0a2
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, forming a link farm, with a primary URL pointing to a game hack. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a download button lure suggest an attempt to trick users into downloading further malicious content. No scripts were extracted from this sample.

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.tw/app/406889139/coin-and-spin-game-hack
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-money-on-roblox-2021_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-iphone-2021_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/como-hackear-roblox-jailbreak_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-gui-hack-pastebin_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-robux-gift-card-generator_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/1-most-best-free-hack-executor-in-roblox-ever_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/hack-coin-master-android_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/money-hack-for-royall-high-school-roblox_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-retail-tycoon-cheat-engine-download_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/free-gamepass-script-pastebin-roblox_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/hack-in-roblox-jailbreak-speed_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/pastebin-robux-promocode-hack-2021_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/hack-xp-net-generators-coin-master_GM406889139.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-noclip-cheat-engine-2021_GM431946152.pdf
    • http://smpn1-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-toy-codes-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033c8.bin
cce5b00ddde9e9187ddc0369ff4a38f662b81279c69a1ab3360ad80305eb2d88		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C8 23500 bytes
font_01_sfnt_off000068b1.bin
74e2f50f1d5b9f4143732ae52f695821b99bc90421c1d391145282a45e766ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B1 18080 bytes

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