Malicious PDF — malware analysis report

Static analysis result for SHA-256 c322169e73e7c304…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 09:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f524889388628742a661f8b0bc20ea7 SHA-1: d2ac309170d952f7a93d57b13c2d35e437cbb420 SHA-256: c322169e73e7c3048e5b9a53e9cbbb10efdd3ddb77ea5e49b8324baf32176578
162 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The document also contains a lure requesting recovery secrets or private keys, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially malicious content supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.
  • 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.online/app/406889139/how-to-get-free-cards-sets-for-coin-master-game-hack PDF link annotation
    • http://lib.kunci.or.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/tiktok-free-840-apk_GM835599320.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-and-coins-coin-master_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_004_off0000533d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533D 25704 bytes
SHA-256: dd3936dbbb6e9ca5e1f4b72fd9e6e76cb6fbb2ff5baedfabb2ad0f252dd8cb4a
font_01_sfnt_off00008dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFC 18048 bytes
SHA-256: 28f75b43f9722380b966cf8b0c528ec574198c6122b1958e13c92a798be1b323

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