Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26581cf24d9eb9b…

MALICIOUS

PDF

42.5 KB Created: 2021-05-19 00:32:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 679bea9103a0d163c8dfafae2b00ff75 SHA-1: c8bb8bca6e80f071220d1f7ed4f3a1d293282ff9 SHA-256: e26581cf24d9eb9bce04ca8156f6ff7b047ccbaa4f4df615fdc287881d83cd68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency or hacks to entice users. It contains multiple links to malicious redirectors, including one that leads to a 'free Robux generator' page. The document's structure and embedded links suggest it is part of a phishing campaign designed to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/431946152/codes-to-get-free-robux-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-daily-spins_GM406889139.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_off000049d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D6 24920 bytes
SHA-256: 36131ed333741b820b77b4a0f74e7f2a69bc13c68e0b5082ebd4f72c08320c92
font_01_sfnt_off0000838e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x838E 18292 bytes
SHA-256: c4e16f213ba515826b0fc8bd2adb9a42249615e2a7fe5232f5ebe2d4ec6172c1

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