Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fd86ad0fba5eea…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 11:48:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7426f3706bb891bc9df35dee735577c1 SHA-1: f84d06570f9210363e69bfcc8859ff4aa52cf152 SHA-256: e2fd86ad0fba5eeaa7fa3b5c08d66e687c9591337903a532ab329ed0e72fb5c4
260 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector domains and lures users with a fake CAPTCHA and a 'game hack' theme, indicating a phishing or credential harvesting attempt. The document body and embedded URLs suggest a focus on popular online games and virtual currency, likely to trick users into providing sensitive information or downloading further malicious content. No scripts were extracted, but the presence of malicious links and social engineering lures is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/coin-master-daily-free-spins-link-game-hack In PDF document text
    • http://somvisio.es/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://somvisio.es/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://somvisio.es/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://somvisio.es/images/roblox-arsenal-hacks-download_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_off00004b7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7C 24884 bytes
SHA-256: efc355b29b5ed114c1e519cf2fa6d1e0f4cc701a76cb0a206520370ba8671060
font_01_sfnt_off000083c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C9 18476 bytes
SHA-256: dd1e9edcae6782c480dff53724a1580fadec54e6656b8ddfb273bcd699f2c343

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