Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e5bd5c28660485…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 08:10:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 21b8a8898bf963abf36d10541cfc2e92 SHA-1: c72ec383422df58c9b3edfaa9536ec355ca285e8 SHA-256: d4e5bd5c2866048529b8f75ab3002c4587884344fa897fb46d8d52b1288db87e
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds a URL that likely leads to a second-stage download. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.online/app/406889139/free-spins-coin-master-2021-game-hack PDF link annotation
    • http://alsworld.com/uploaded_files/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/play-coin-master_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/pokemon-go-free-coins-2021_GM1094591345.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0B 24732 bytes
SHA-256: 053aac13a4e7b626f020be4fc40588a91bafa10dd83eafae126fdc13105bea24
font_01_sfnt_off00008779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8779 18288 bytes
SHA-256: 9732707b45c862b7a6ef8ea2418900def9be3650c6b325207d932644f64622ad

Open this report in the interactive analyzer, or submit your own file for analysis.