Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b85055c6ae47a75…

MALICIOUS

PDF

48.9 KB Created: 2021-06-08 18:46:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3f9c8d21a3dbdf2178c7c74cc94b92b6 SHA-1: b984c584a44fdcd5db4753fec766bc9c11be4580 SHA-256: 5b85055c6ae47a75670444ec8e95c17111c2853c120161c51ddd9771c1660453
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are structured as SEO-optimized URLs pointing to game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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.tw/app/431946152/roblox-teasurenhunt-simulator-hack-game-hack
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-cards-link_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/toolbox-mod_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/where-to-get-free-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-launcher-download-free_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-game-hack-online_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/games-like-coin-master-for-free_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-mobile_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-using-promo-codes_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-sites-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/buy-robux-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b9.bin
fef608cc46f664133d4111a42c8e6c47248448f0e75af73433e762b05318a231		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B9 25796 bytes
font_01_sfnt_off00008d74.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D74 5696 bytes
font_02_sfnt_off00009a86.bin
b6fdd86269a48bbc353fc062ffdcbdcc6a864f2de07b2e836f4f1c4926c417bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A86 18972 bytes

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