Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc498a90ced0f064…

MALICIOUS

PDF

43.4 KB Created: 2021-05-11 04:49:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 97d6f30edf4510c37448b12b3e7e3ab1 SHA-1: 2b0c424ec733de5ae30fbecbfeb1507810376948 SHA-256: cc498a90ced0f06467d5a3bd5530ef6626b8433ee3ed2e3e6b463bae694ed3d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, identified as malicious redirectors. These links are presented as "game hacks" and "free generators" to entice users. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to potentially malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/coin-master-links-that-don-t-expire-game-hack In PDF document text
    • http://greasley.website/images/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://greasley.website/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://greasley.website/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://greasley.website/images/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000470a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x470A 23628 bytes
SHA-256: ae9332261d847fb32afe8f6474757c00bc525dec36fdd651ef18798f3ca6d1e6
font_01_sfnt_off00007cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB6 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 18436 bytes
SHA-256: dce3e1f078114056c7a9f64f23754c2b9e2cd17dc36a219649f8cd9aa09ae054

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