Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaf5f3ab8cc7d34…

MALICIOUS

PDF

35.0 KB Created: 2021-06-26 09:01:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1c987b4b40578e80c8993d89737bee0b SHA-1: e7b57b24e9bd9684114afb471661c338f2f61301 SHA-256: 6aaf5f3ab8cc7d346f32641041e9e76beccdf0979e037ae32e7f93157747e452
122 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'free Robux' and presents a fake CAPTCHA to trick the user into interacting with a malicious link. The primary link, http://netcdn.co/app/431946152/free-robux-everyday-game-hack, is likely intended to lead to a second-stage download or exploit. The document's content and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-everyday-game-hack PDF link annotation
    • http://www.woundcare4heroes.org.uk/uploads/files/files/2021-free-robux-no-website-2021_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/comment-avoir-un-dominus-aureus-free-ssur-roblox_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/roblox-free-shirts-to-put-up-for-sale_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/fortnite-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-roblox-app-for-android_GM431946152.pdfIn PDF document text
    • http://www.woundcare4heroes.org.uk/uploads/files/files/free-stuff-in-the-roblox-catalog_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_off00003016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3016 22900 bytes
SHA-256: e715af1afc88d197f005b85af25eb06bc45913405e7a6724a5231fc5e446c5f4
font_01_sfnt_off00006327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6327 19184 bytes
SHA-256: fed176fcf3f4672bffce7ce965b09d6bfdbb167f2c70fffb5cb293b4fa304488

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