Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69da58d59bfcf0c…

MALICIOUS

PDF

42.0 KB Created: 2021-05-10 20:05:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 67a467c8e2e9c609fdb154fde8a4bcc6 SHA-1: 24037d91814df572dc25bf3a15a74c8088aaa9cf SHA-256: c69da58d59bfcf0c5da8a50a450e7c826ea657b8da6686bb6411b0ed97600592
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, specifically promoting "free generator / game hack" content. The primary malicious link identified is https://netcdn.xyz/app/406889139/free-spins-on-coin-master-2021-game-hack, which is part of a chain of redirectors. While no scripts were extracted, the document's structure and embedded links strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/free-spins-on-coin-master-2021-game-hack In PDF document text
    • http://dobrovodie.ru/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://dobrovodie.ru/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://dobrovodie.ru/images/free-stuff-on-roblox-2021_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_off0000496d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496D 24488 bytes
SHA-256: 04ad95effa96568e6b7850e3439e33adbbb72ab5092cf5f1ff9efc7dc1a6e1dd
font_01_sfnt_off000081b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B8 18288 bytes
SHA-256: e7fc04cebd192de8ea685c8f65a9790caba4d729d1f53b0455241ee170bde56f

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