Malicious PDF — malware analysis report

Static analysis result for SHA-256 b914bf0aaa46b1a9…

MALICIOUS

PDF

42.3 KB Created: 2021-05-11 05:36:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8f8b80da168afc5afe8a53c776674292 SHA-1: 3dce5570efd978b4d2f2c569cb18f8f767bcc1a9 SHA-256: b914bf0aaa46b1a90e94695ed43b2018d954f5c07e09cfb791d38ced1f17ac40
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9971

Heuristics 6

  • 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.
  • 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.xyz/app/431946152/roblox-hack-ga-game-hack PDF link annotation
    • https://sunnygarden.com.tw/image/data/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-freebies_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.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_003_off0000479a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479A 27188 bytes
SHA-256: 004ed1c9c80d3c1cbe5b269cc43f83ace44a643d43cf131a680507ec03ad2038
font_01_sfnt_off0000831f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831F 18184 bytes
SHA-256: 3275d650180bfb45a9fb7d5756aac43dcbbafe87c7818dab7a1b2e1f44194404

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