Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844c066c0eab7ed…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 22:01:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b0b73fd60eb8529a6528dc7ac8981c45 SHA-1: 208b4215d44b3fe2c40eec4f157b51dcc2b43600 SHA-256: b844c066c0eab7edb73e3f81d75241c97015b89b08cf97f0659245f1ba4d3600
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document employs a lure related to earning Robux, directing users to a malicious redirector. The document also presents a fake CAPTCHA or human verification prompt, likely to trick users into executing further malicious actions or downloading additional payloads. The embedded URLs suggest a phishing or scam campaign aimed at users interested in in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/how-to-earn-robux-on-roblox-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/tiktok-free-login_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-free-zaragoza_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/i-caught-my-mom-cheating-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-verification-or-survey_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
font_00_sfnt_off000051c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C9 27516 bytes
SHA-256: 901c99b8c05b03038e457668e7b1a6566841f60a51309e78873bd3b7adedf2e9
font_01_sfnt_off00008f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F28 18316 bytes
SHA-256: 648fa2b30230dc2606705c3a90d8924a9412c1d260df5319690c757a03f83928

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