Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd9f307ef4c7a54…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 14:50:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 75744486dae6575cd12f87ce5cd8b204 SHA-1: 6767426691478772ad02b22dcf06da7ccc688331 SHA-256: 8bd9f307ef4c7a5401b28bfba3346e462e9c3efab2c58743b86342d788bbe6bd
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into interacting with a malicious link, likely to download a second-stage payload. The embedded URL and numerous other links point to sites offering 'free Robux' or game-related cheats, a common theme in phishing and scam documents. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-get-free-robux-with-roblox-gift-word-press-game-hack PDF link annotation
    • http://modlingua.com/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/free-spin-link_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/roblox-royale-high-diamond-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/pubg-uc-50-tl_GM1330123889.pdfIn PDF document text
    • http://modlingua.com/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/roblox-free-robux_GM431946152.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_off000051cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51CB 26140 bytes
SHA-256: 9bffef5019b02a3e9de205819d81a01c24c2f993c344113969d84f11f5c8383d
font_01_sfnt_off00008e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E62 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0A 19168 bytes
SHA-256: 1ec33724c5867533c9688b39afd23cad9b83240576edadcb72fc50a153918674

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