Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a953e3c95002bf1…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 22:12:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 294b8727776bcc33def28eb3efed3fd3 SHA-1: 885936f0bda2873aa744021aa10b504e8b8b8b6e SHA-256: 8a953e3c95002bf1d5b95db7a216bad653c3283df7923d6c8c7cfe59738eec87
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a 'download' button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful applications or further malware. The primary URL associated with the download lure is https://netcdn.online/app/406889139/coin-master-hack-game-download-ios-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-hack-game-download-ios-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-modded-minecraft-server-hosting_GM479516143.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_off000053ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53EC 25444 bytes
SHA-256: 7b56cf06303783890e17aeaa1ff087d538ca064f057ed2246d6b1e7f6bc7770a
font_01_sfnt_off00008d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6B 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off0000986e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x986E 18556 bytes
SHA-256: bbb16adb579c26ea7dee9b6864ebd489bd68511943ce27e2a97e1917f0909ab0

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