Malicious PDF — malware analysis report

Static analysis result for SHA-256 47093adc7cb29fbb…

MALICIOUS

PDF

49.1 KB Created: 2021-06-11 07:23:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f613a03b3b96b5d6e0e797ee0efcf29 SHA-1: d376770c9ab2220e86058cb7a00c405b4c5f066d SHA-256: 47093adc7cb29fbbbfb7b3b2008e637eee6e43d4b0ffff818d0ac91229bbdb82
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to redirect users. The presence of a fake CAPTCHA heuristic indicates a social engineering tactic to trick users into interacting with the document. The document's content and linked URLs relate to game cheats and free in-game currency, a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/cheat-big-paintball-roblox-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/tiktok-free-zone_GM835599320.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/earn-robux-com_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5012 27200 bytes
SHA-256: 7bcbb8e19405da24f4ae68659599c8baec5112217f7071b2bacce0d245a63d4e
font_01_sfnt_off00008e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9E 18844 bytes
SHA-256: d2e4644d3432cfbbaf7fa220910870d631516bbccc54e99b2e64c36753553a6d

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