Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bc4581dcb76738…

MALICIOUS

PDF

60.6 KB Created: 2021-06-09 13:29:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f43955c1f7ded9cbe89c7acb1c984c55 SHA-1: 64b1caf5e86833a4f2ba64390a0b349c3003e142 SHA-256: a0bc4581dcb767388567bb8947f078a8d84f38bbe7aef4524108e824dd80b55d
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are SEO-optimized PDF links, suggesting a link farm designed to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a "Roblox Hack". The presence of a "password-protected archive lure" heuristic further indicates an attempt to conceal malicious content, likely a payload, from initial inspection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-hack-build-you-one-boat-ccv-game-hack PDF link annotation
    • http://library.persadabunda.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/dabi-roblox-free-shop-t-schirts_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000555d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x555D 27472 bytes
SHA-256: 9a38044ff33fde5ead4ffed9e19b6bd501b53dd784d4d47077a1a7919a084f9e
font_01_sfnt_off000095d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D6 8132 bytes
SHA-256: e6d68e720ea5acf9dccbf7ffde18db6f65c62a99ab7725aa43e30329033a7787
font_02_sfnt_off0000b0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BE 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000bdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC4 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_04_sfnt_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 18996 bytes
SHA-256: 97073ab0d75cc1c3524b4c67ff03f61582135537e2a2fbd9fea888f2a6b10c1d

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