Malicious PDF — malware analysis report

Static analysis result for SHA-256 905eb74db046433d…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 10:14:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8fc412c0886cd7cd834490cb57d583fd SHA-1: 4e2a7c8208df0aa470d904a47cc2644a09bb6a0e SHA-256: 905eb74db046433d280a87b514a2300955bbdaee68f784f6710acd7bde0d00f4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links to external PDF files, many of which appear to be SEO-optimized lures for game cheats and hacks. The document body also contains a direct link to a Coin Master mod APK, suggesting a deceptive attempt to trick users into downloading potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness.

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.online/app/406889139/coin-master-mod-apk-free-download-for-android-game-hack
    • http://www.library.umbjm.ac.id/repository/free-robux-apk_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-iphone_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-fan-club_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-games-free-to-play-online_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-building-hacks_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/to-get-free-robux_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/https-oprewards-com-roblox_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-and-cheats_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-items_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/robux-earning-sites_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-real-2021_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/hackear-coin-master-sin-verificacion_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f60.bin
89d43e45095ce6dbaf472280572415f1bea990a13b4332c239c1d11859483c10		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F60 23940 bytes
font_01_sfnt_off00008555.bin
430b8c6468b29bcb8a063019981b9f21e2cad4554a01abe6c0aff1c8414741f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8555 18636 bytes

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