Malicious PDF — malware analysis report

Static analysis result for SHA-256 53988f70d3518cc5…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 23:48:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b8c42d76f6a0d5c03d8fb0c5db543048 SHA-1: 2f9765f5ad264cf5377461a155997726674def6c SHA-256: 53988f70d3518cc54f2d3f960435315c1d95af05dfc89a6e26d3d23e4d0330ad
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document contains numerous external links, many of which point to scam-related content such as 'free robux' or 'coin master hack'. The presence of a fake CAPTCHA or human verification prompt strongly suggests a social engineering tactic to trick users into clicking these links. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/how-to-get-free-robux-without-verifying-game-hack
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-july-2021_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-stop-attack-hack_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/download-hack-coin-master-apk_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-website_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/real-coin-master-free-spins_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-apk_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-models_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-roblox-gift-card_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spin-links-coin-master-2021_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-35-2-hack_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/app-store-coin-master-free-spins_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-money-hack_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-game_GM406889139.pdf
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-spins-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bc1.bin
a1f90164e6315c416e66c3d363867ef98ccf8f89106a7ee24f2ebb06f9e2034d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC1 24704 bytes
font_01_sfnt_off00008472.bin
63de63cfc252acdf530e8b3b2390dbc20d855d9653817057ed506b48c41b68ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8472 19368 bytes

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