Malicious PDF — malware analysis report

Static analysis result for SHA-256 3083c16c59a3b760…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 02:47:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 461bdbd2974833945c7cedadc753dde5 SHA-1: 8cce892aaf620e0b1e786c28192eaefa6e792645 SHA-256: 3083c16c59a3b760fde94672bfcb169aa54d5dd4d49638bf4d4d19c13875db71
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a "link farm" structure, strongly suggesting it is designed to redirect users to external sites for malicious downloads or scams. The presence of game-related lures like "Robux Withdraw" and "free spins" indicates a social engineering tactic to entice clicks. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious downloader or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/robux-withdraw-game-hack
    • http://perpus.fisip.unnur.ac.id/repository/free-spins-coin-master-no-survey_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-800-robux_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-hack-ios-apk_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-roblox-clothes_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-roblox-accounts_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/games-that-give-free-robux_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-links-2021_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/http-coin-master-hack-club_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/robux-get-com_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-roblox_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-village-4_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051c5.bin
76f74542ffc475d1e2c6b9b042bdc203e94a1bee7d715cf5d94de9c24730a159		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C5 30808 bytes
font_01_sfnt_off00009665.bin
afbca514ad09227755e431614afc8addacc3d3b35e400dc0197c8deef3f460d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9665 19004 bytes

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