Malicious PDF — malware analysis report

Static analysis result for SHA-256 895dfffcef2dcecf…

MALICIOUS

PDF

227.1 KB Created: 2021-07-04 13:38:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0bd9ecfd697308bae0d0467ce3e40d8d SHA-1: 6a2a306fe7ba0a269db6524cca3e1b58e651413d SHA-256: 895dfffcef2dcecf3e1a6b59e63101088fb1de753fe50d264e930ccef45220c0
132 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and a browser extension installation lure, aiming to trick the user into downloading a malicious file. The embedded URL http://netcdn.tw/app/1094591345/pokemon-go-free-download-game-hack likely hosts the secondary payload. The document's content and heuristics strongly suggest a social engineering attack to facilitate malware installation.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/pokemon-go-free-download-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/how-to-speed-hack-on-any-game-on-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-scripts-roblox-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-roblox-promotion_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-no-human-verification-2021_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_023_off00031fba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31FBA 25576 bytes
SHA-256: b4c53df2d8ff16520de1a25e13e541b05aa3f0bd9f123e7988f23f873d0472e7
font_01_sfnt_off00035bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35BBB 18940 bytes
SHA-256: 35d0aac4b688ba2d3778bce521545e603087c53921ee31f4c9e30c8222ed3ae0

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