Malicious PDF — malware analysis report

Static analysis result for SHA-256 619e8dc4b7b0e699…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 12:52:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 09f477825cd154c55a28c6fd84f451f5 SHA-1: a90c50853c7e065b861f364e87db7f14f16de962 SHA-256: 619e8dc4b7b0e699f1168fbe2af21811109ed2faa5e07a7118e77aee95d2eeb0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external resources. The document body, though partially corrupted, suggests a lure related to 'Coin Master' and free spins, aligning with common phishing tactics. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/coin-master-link-daily-get-free-spins-amp-game-hack PDF link annotation
    • http://pengolahan.perpus.wima.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/pro-pubg-xyz-uc-hack_GM1330123889.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-get-free-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_004_off00005391.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5391 24792 bytes
SHA-256: b5cbd3449baa13c266c2051910446b17196487431884f53e0c93622fd74a755f
font_01_sfnt_off00008c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9C 18740 bytes
SHA-256: 3c4f21502df3cd9acdde9268991fc9ac05791a4d697f365fbbd9610c3169f79a

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