Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38eb1a9e0e5f803…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 23:35:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c28387c193fdd8759cc58d089848247e SHA-1: 12a8bb5ab8786d71a203e969683af3b2b4bd8f97 SHA-256: b38eb1a9e0e5f80372d5a4dacfc390f5e9049167958ff8d4a2401ca8633c341e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are related to game cheats and free in-game items, indicating a likely phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a link farm or a method to distribute further malicious content. No scripts were extracted, but the document's structure and content point towards social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/hack-to-protect-village-on-coin-master-game-hack
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-scam_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-ios_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-spins-2021_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-spins-from-coin-master_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-app_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/robux-free-online_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/get-free-coin-master-coins_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-minecraft-premium-account_GM479516143.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/robux-withdraw_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/roblox-cp_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/hack-game-coin-master_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-hack-app-for-iphone_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-coins-for-coin-master-blogger_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/minecraft-windows-10-free-code_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a65.bin
a99bfa7bd215b4ef656499d74807ea8457d62439d02fa407e2a4a1de25fc5111		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A65 25376 bytes
font_01_sfnt_off0000845f.bin
d6679102133a2002bfb5d521323467f00363df482f5150c6da4fdb9b85ad9332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845F 18368 bytes

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