Malicious PDF — malware analysis report

Static analysis result for SHA-256 142be9ea31652673…

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 13:51:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d4b4c15e4e19ff56f1a873b0fe102052 SHA-1: abfd4927b6261a2303a7ab278b10e64c3bb2c05d SHA-256: 142be9ea31652673afacce9a82ab4e675cb094f70d611ad61b33e4176378359c
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various game-related scam pages. The primary URL http://netcdn.tw/app/406889139/coin-master-heaven-daily-free-spins-and-coins-links-game-hack is a clear lure for free in-game currency. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-heaven-daily-free-spins-and-coins-links-game-hack
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/with-pokemon-go-free-download_GM1094591345.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-texture-packs-for-minecraft-pe_GM479516143.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/robux-websites-that-work_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/como-hackear-coin-master-ios_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-play-roblox-for-free_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/script-roblox-tycoon-cheat_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-groups-that-give-you-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/cm-spins_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/rbx-roblox-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/roblox-top-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/mcpe-master-coins-hack_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/ww-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-promo-code-2021_GM406889139.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/how-to-have-200-robux-free-robux_GM431946152.pdf
    • http://www.sarrafoods.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdf
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.html
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003215.bin
061f1f4f184f27a46ebbe2dc7c7772cadcfb961fd2b391e15bcea5fcc8c4a231		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3215 23044 bytes
font_01_sfnt_off000065e2.bin
803b08b6f06247c41f0de4833b75fa2b1ccb1155f19f5f0c28bf2f4e3a032072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 19056 bytes

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