Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36cdd0b98ba6780…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 19:34:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f5c197f6807d0d7f32d03e5abe280d27 SHA-1: 28b5665f9e7173b57abef6497785c693116b7b7f SHA-256: b36cdd0b98ba67806b38e8ecc9dbb3b0899ff808af31932942db2dc7cd5e6c07
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which are SEO-optimized and point to pages related to game cheats and hacks. The presence of a download button lure and the ML classifier flagging the PDF as malicious strongly suggest a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a link farm designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/master-coin-hack-mod-game-hack PDF link annotation
    • https://www.acacss.com/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/easy-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/roblox-executor-free_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-minecraft-alts_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_003_off000048a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A1 28204 bytes
SHA-256: d61bbcfed33b1eeae1226290d221ac5f42d093050f7078e4ff34e771b1738456
font_01_sfnt_off00008751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9103 17888 bytes
SHA-256: 79663f5c6e364485b04b83db578590d29b6e1ee38eddb5c45b054f63581374ad

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