Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ad9d7d25aa4cca…

MALICIOUS

PDF

48.5 KB Created: 2021-06-11 09:17:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a13df860fd3d46baa29ab70bfb39453f SHA-1: 1ad7bf54723b424a97465a9db79efd4dcc826f3b SHA-256: 43ad9d7d25aa4cca51bf22f20afef970cdd01481a17ea34a68b2f2eb19105d7b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to mimic search engine results. The primary URL points to a site offering 'free model game system roblox game hack', suggesting a lure for potentially malicious downloads or scams. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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-model-game-system-roblox-game-hack
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-coin-master-spins-blogger_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/como-hackear-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-minecraft-resource-packs_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-robux-claim-generators_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/can-i-play-roblox-for-free_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/haktuts-free-spins_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-get-wall-hacks-in-roblox_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-hack-coins_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/client-minecraft_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-hacks-for-pet-food_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-hack-for-android_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://perpustakaan.man2kotaserang.sch.id//repository/pubg-uc-and-bp-free_GM1330123889.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-free-download-app_GM406889139.pdf
    • http://perpustakaan.man2kotaserang.sch.id/repository/retail-tycoon-roblox-cheat-engine_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052f8.bin
fa2974125868ff0d1c27f2198ffd659ca9fbefe4f415ace39e6b50f86c3fb794		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F8 30664 bytes
font_01_sfnt_off000098b3.bin
a5045b8c9c1d15942157a64c4cdc2b1557df508f147c117b9c66757c4d5df9d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B3 19088 bytes

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