Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fd95b22d4dd98f…

MALICIOUS

PDF

44.6 KB Created: 2021-06-10 18:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c4f38c2239c2c5c5ecf6a0dc41336efc SHA-1: 8e3554ed9ba6610bbb79d165c90551e54b780917 SHA-256: d1fd95b22d4dd98fce7ed2d2e9b95a126ad7483467a61634357acf3b50e10fe2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified as a link farm, pointing to sites offering game-related cheats and currency. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-using-inspect-2021-game-hack
    • http://lib.stie-aub.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/online-coin-master-free-spin-app_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/free-gfx-roblox-maker_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-app_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/roblox-roblosecurity-hack_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-spins-apk_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/free-robux-pastebin_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/free-minecraft-shaders_GM479516143.pdf
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/minecraft-rtx-download-free_GM479516143.pdf
    • http://lib.stie-aub.ac.id/repository/unlimited-robux-2021_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-uk_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-android-root_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/scripts-for-free-robux_GM431946152.pdf
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdf
    • http://lib.stie-aub.ac.id/repository/how-to-get-codes-detector-robux-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d5e.bin
ba84e6a91717fa812a39d5d566c29db0cdf83cdd5f3edd5b7f845cb8ccd07ed1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D5E 25804 bytes
font_01_sfnt_off0000889f.bin
7664014de8ea9c8ec8afd97aea986950b101c9f70d914951716e0559252ae510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889F 19288 bytes

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