Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5178d9dc5f59f7…

MALICIOUS

PDF

44.0 KB Created: 2021-05-17 10:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2030eb802edbb550803902a8f32455c7 SHA-1: c978ca4593e01b4eb71e2bd38f425489e1a9f15e SHA-256: cd5178d9dc5f59f7576741aa480b8f0696c7de85eca3da70b7a4947acb59e1d9
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is designed to trick users into clicking links for game hacks and free in-game currency, likely as a lure for phishing or malware distribution. The document presents a fake CAPTCHA or human verification prompt to encourage interaction. It contains a large number of external links, many pointing to SEO-optimized PDF files, suggesting a link farm or content-spamming operation. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/free-roblox-accounts-with-robux-that-work-not-banned-game-hack PDF link annotation
    • http://ecoleduchat-grenoble.fr/images/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-robux-generator-2021-no-human-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
stream_003_off00004c79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C79 25312 bytes
SHA-256: d89960cd8c0f184584850df892c027dc2ae35021d7d8776bbdc3ad1e542816d3
font_01_sfnt_off00008709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8709 19248 bytes
SHA-256: efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783

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