Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b62db9c1d61c08…

MALICIOUS

PDF

43.1 KB Created: 2021-05-18 02:53:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: edd99b5ebb573abd5baa464dee062d04 SHA-1: 29b2bb652ac015d02517503a710a8acb580d20ff SHA-256: f1b62db9c1d61c08ec1746f2e0649d5c310e151983002033a1c412c208e617ab
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files, a pattern often used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a potential for further exploitation or redirection to malicious sites. The document body, though heavily obfuscated, contains a URL that aligns with the detected external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/coin-master-heaven-free-spins-link-2021-game-hack
    • http://stpc.it/images/coin-master-link_GM406889139.pdf
    • http://stpc.it/images/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdf
    • http://stpc.it/images/how-to-win-free-robux_GM431946152.pdf
    • http://stpc.it/images/coin-master-heaven-free-spins-and-coins_GM406889139.pdf
    • http://stpc.it/images/free-gold-cards-for-coin-master_GM406889139.pdf
    • http://stpc.it/images/how-to-get-free-robux-fast_GM431946152.pdf
    • http://stpc.it/images/coin-master-hack-software_GM406889139.pdf
    • http://stpc.it/images/how-to-get-free-robux-without-offers_GM431946152.pdf
    • http://stpc.it/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://stpc.it/images/roblox-skins-boy-free_GM431946152.pdf
    • http://stpc.it/images/coin-master-free-spins-daily_GM406889139.pdf
    • http://stpc.it/images/free-robux-without-verification_GM431946152.pdf
    • http://stpc.it/images/coin-master-hack-for-android_GM406889139.pdf
    • http://stpc.it/images/minecraft-client_GM479516143.pdf
    • http://stpc.it/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://stpc.it/images/coin-master-apk-hack-2021_GM406889139.pdf
    • http://stpc.it/images/coin-master-daily-free-spins-hack_GM406889139.pdf
    • http://stpc.it/images/coin-master-jackpot-hack_GM406889139.pdf
    • http://stpc.it/images/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdf
    • http://stpc.it/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c42.bin
2edc550b58ccfd76d476eebf405a69f2d937a8acdfd42f757a5ddac466a31530		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C42 25532 bytes
font_01_sfnt_off00008552.bin
9953a6bcf7299cdc3f53a486839c0d2d9be693cd5b14fd285ca1faa973488d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8552 18572 bytes

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