Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ac36b8ead86058…

MALICIOUS

PDF

47.6 KB Created: 2021-05-10 21:02:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 421e8b1810be5773655556bf95da4c3f SHA-1: dbbe732cedb78670da0acc4b927bb96d92fdf2ee SHA-256: 81ac36b8ead860587144dc06ba9b54ebbbdddbecbbe1c3db8538a389faa34f6d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on external domains. The primary URL, https://netcdn.xyz/app/406889139/coin-master-free-daily-spins-game-hack, suggests a lure for in-game currency or cheats. The ML classifier and the PDF link farm heuristic strongly indicate malicious intent, likely to drive traffic to potentially malicious sites or facilitate phishing. No scripts were extracted, but the document structure and embedded URLs are indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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-free-daily-spins-game-hack PDF link annotation
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-pro-gamers_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_003_off00004c1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C1C 26300 bytes
SHA-256: 98fdc2d6095c3ce4a227638f57c825464979fefa1e9276949f11db6a033278ee
font_01_sfnt_off00008a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00009789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9789 18308 bytes
SHA-256: 5c3cefeee4a209382fad51155f4ab19c665f35dca270fe96ae1b58d23c3d8f95

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