Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbdebc8ee071e05…

MALICIOUS

PDF

36.3 KB Created: 2021-07-05 07:22:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d5f340e956bdc4132bfbafec4e624da6 SHA-1: 6d55a106f89e7eb65448d463a739eaeb63b52f47 SHA-256: adbdebc8ee071e05c236ab57a4b549b533aac3e3c6a99dc51ea0e03679766efc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, presented as a 'link farm', that direct users to external websites. These links are disguised as offers for free in-game currency or items for popular games like Coin Master and Roblox. The primary purpose appears to be to drive traffic to potentially malicious sites that could host further malware or phishing content. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a 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/daily-free-spins-coin-master-2021-game-hack
    • http://perpus.unpam.ac.id/repository/roblox-apocalypse-rising-hack_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/minecraft-education-edition-free_GM479516143.pdf
    • http://perpus.unpam.ac.id/repository/free-robux-groups-2021_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdf
    • http://perpus.unpam.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://perpus.unpam.ac.id/repository/free-roblox-redeem-card-codes-2021_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/coin-master-reward-link_GM406889139.pdf
    • http://perpus.unpam.ac.id/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • http://perpus.unpam.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/how-to-get-free-roblox_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
    • http://perpus.unpam.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • http://perpus.unpam.ac.id/repository/free-minecraft-skins-pc_GM479516143.pdf
    • http://perpus.unpam.ac.id/repository/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • http://perpus.unpam.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://perpus.unpam.ac.id/repository/free-online-roblox-code-generator_GM431946152.pdf
    • http://perpus.unpam.ac.id/repository/how-to-hack-roblox-with-cheat-engine-65_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000336e.bin
e994192b00639dd8499eac92dfb3ba42538769fe5989bf3c069ece4f867af11c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336E 23552 bytes
font_01_sfnt_off00006903.bin
933a9abb3ea4f8fbe1c77bcd3d2591622a827aeefe2bea77f70e7028cf79008c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 19000 bytes

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