Malicious PDF — malware analysis report

Static analysis result for SHA-256 3812e271b320e0f3…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 17:26:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3358550e2fc725df4c310700250b5866 SHA-1: 1ab76d9f8daae666809c14d3109a3ebab174812e SHA-256: 3812e271b320e0f39f508670ecbd9eb851a6a24f9b0423714c7dd83d2fbb324a
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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-hacks-for-trading-pet-simulator-roblox-game-hack PDF link annotation
    • http://mebliok.com.ua/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://mebliok.com.ua/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/robux-win_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://mebliok.com.ua/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://mebliok.com.ua/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/roblox-catalog-free-items-2021_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/minecraft-free-version_GM479516143.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_off0000526f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x526F 24308 bytes
SHA-256: 43cb0502f60dc02535d8ad4286f5ac7eeaa99b4ae4702fbf7b9afb9f91bb3cbb
font_01_sfnt_off00008a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A30 19748 bytes
SHA-256: 6c0bbebda90c609fc9c048acf6a02114e488cc2af73cf691b59e600733997de9

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