Malicious PDF — malware analysis report

Static analysis result for SHA-256 9730f61921cce74f…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 06:31:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 72255d33938b0d4356f02b361d77e083 SHA-1: acfe1bd84fa821bc493874adb1f73ad789edb496 SHA-256: 9730f61921cce74f097d9ab71bb33bd7da62b893d1ec744432e9d7cf34afa933
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 external websites. The document body, though partially corrupted, suggests a lure related to 'Coin Master' or 'Robux' to entice users to click these links. The presence of external URIs and the ML classification strongly indicate malicious intent, likely for SEO spam or to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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-free-spin-ml-game-hack
    • http://perpustakaan.poltekom.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/haktuts-coin-master_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/is-minecraft-education-edition-free_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-2021-free-spins-link-blogspot_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/minecraft-bedrock-client_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-free-robux_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/free-robux-without-any-verification_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/free-robux-hack-generator_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdf
    • http://perpustakaan.poltekom.ac.id/repository/pokemon-go-free-zapdos_GM1094591345.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://perpustakaan.poltekom.ac.id/repository/instagram-free-coin-master-spins_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-apk-android-1_GM406889139.pdf
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005280.bin
da93508816d83c01d12cffdace76cf1b7acee2997235a6c66ac854751c305cf4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5280 24560 bytes
font_01_sfnt_off00008b19.bin
30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B19 2840 bytes
font_02_sfnt_off000094cc.bin
444b71fec9169bc90a734dd5dd223b39b45661ce510f738c863c1de9395466a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CC 17960 bytes

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