Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7c5d83f9d4d85b…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 23:36:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cdd747f47c2d79cdd75b70d877f45e31 SHA-1: 942775abddfaf68bda1d2f1b4773c92dec7d63fa SHA-256: 2f7c5d83f9d4d85b63a14debdc8c8c3e1217412886bd32a25b4f1ed5d4e2c650
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized links for free virtual currency. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The embedded URLs likely lead to a phishing site or a malware download, attempting to trick users into believing they will receive in-game rewards.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/get-free-robux-now-game-hack
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/rewards-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/real-free-robux-codes_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/free-gifts-coin-master_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/pubg-uc-20210_GM1330123889.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/free-online-spins-coin-master_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/free-coin-master-spins-link_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/best-hacked-client_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/minecraft-pocket-edition-free-ios_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005093.bin
f218fcb7cb28f27b90152da6ecece0d8d4c1f07a79c657782e10653afc6e0181		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5093 28116 bytes
font_01_sfnt_off000091cc.bin
538c9dd0db01d2f7ccbac1c4b1e59781ee6b2d24c7879b3cb67aab50807a8027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CC 18280 bytes

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