Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c71d38a40f50362…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 07:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: addd6ac7d3353f2ebb6f3dbd952a89dc SHA-1: 1cf6b632ce5237f0a3140658695d87d1342b2b21 SHA-256: 2c71d38a40f50362dc15b959fc2a04e270d3b28bd7c18752d8414a4bbb8f8869
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a mass of external links, many of which are disguised as a fake CAPTCHA or verification prompt to trick users into clicking them. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially malicious content supports this. The document's content and structure suggest a lure for downloading unwanted applications or potentially further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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/406889139/mcpe-master-hack-coin-apk-game-hack PDF link annotation
    • http://omahahospitalityhalloffame.org/images/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://omahahospitalityhalloffame.org/images/free-coins-coin-master-link_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_off00004b45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B45 25008 bytes
SHA-256: 26cb5c5e882ce5e947eb8c5d6abd43d04d516df7e32fa068878d48bddfcf1592
font_01_sfnt_off00008524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8524 17892 bytes
SHA-256: 93da02f41e67913bc0a94206f0ae171fc884c873a1823406ba79fdc99dac21fe

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