Malicious PDF — malware analysis report

Static analysis result for SHA-256 783269231dcf7fa4…

MALICIOUS

PDF

44.8 KB Created: 2021-05-18 04:12:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3fd58e23e05c08180ac0b9afe7bc297d SHA-1: 1cf170b738d5144c0ef2dc2d39b31923181cfc75 SHA-256: 783269231dcf7fa4523beae19e81de1eda3aa15e8b7eda65612c8bdf221f8f47
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 0.9632

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/can-u-get-free-robux-game-hack PDF link annotation
    • http://bob-reid.co.uk/uploads/files/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/mcpe-com_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid.co.uk/uploads/files/files/how-to-get-free-coins-in-coin-master_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
stream_003_off0000471b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x471B 25556 bytes
SHA-256: 468566ec1392709f43d1ad233a4c39026025d46815d9751299f0594d8e1a1518
font_01_sfnt_off000081a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A3 2880 bytes
SHA-256: 106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081
font_02_sfnt_off00008b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 18532 bytes
SHA-256: 35bb0f01f69d1b5e790ed5f4c0eeb98998139975dc1eb58b588dc01b9002bbc1

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