Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3ff6ee0e2339e7…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 08:56:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: acde611423d161232673831ce077ae7c SHA-1: dafd2fee147eca8071e8f6fdd56dd3125eac9e9e SHA-256: af3ff6ee0e2339e76c4749c8bc49ddabe13758fabeac87ac00ce5f13313f96d9
102 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to external PDF files hosted on a link farm. The ML classifier strongly indicated maliciousness, and the presence of a "download button" heuristic suggests a deceptive user interface. The primary goal appears to be directing users to a network of SEO-optimized PDF files, likely for traffic generation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/coinmaster-rewards-game-hack PDF link annotation
    • http://en.furuise.com/Public/upload/editorfiles/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://en.furuise.com/Public/upload/editorfiles/coin-master-game-legitimate-hack-without-signing-up-or-shareing_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_004_off00005160.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5160 24548 bytes
SHA-256: ce61f9dfa3e8fb76f565461600e5bdb32c6f33a622a88f10e28a290fcf958027
font_01_sfnt_off000089b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B1 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off000093dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93DD 18144 bytes
SHA-256: 3304910cf416930b47305d75e02d2266dd9cc93df9b4dcfa32843af2f30c9813

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