Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ddd6dec773efa3…

MALICIOUS

PDF

42.9 KB Created: 2021-05-11 07:33:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5810ea219564239dd1d3388d122a9ade SHA-1: a40b123f268158944a05259fce38e9570b1278bd SHA-256: 87ddd6dec773efa3bd544c5ad309e5fdcd77dc99e611214f31d31a0e817be9d0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are disguised as legitimate resources but lead to potentially malicious content, such as the URL 'https://netcdn.xyz/app/431946152/free-robux-easy-and-fast-game-hack'. The document's content and structure strongly suggest a lure for users seeking free in-game currency, a common tactic for distributing malware or leading to phishing sites. The presence of a link farm heuristic further indicates a deliberate attempt to obscure malicious intent through a large volume of outbound links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-robux-easy-and-fast-game-hack
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-realistic-minecraft-texture-packs_GM479516143.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-hack-generator_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/claim-free-robux-button_GM431946152.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/level-coin_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/robux-matchcomfree-robux_GM431946152.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-blogspot_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/roblox-games-with-free-boombox_GM431946152.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-cheat-to-get-free-spins_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-coin-master-spins-2021-link_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdf
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdf
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-private-minecraft-server_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a1a.bin
1b1f00a6e3429ce81b68099b409ff289f0784736da78da3a50eb94e1512a3a49		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1A 24892 bytes
font_01_sfnt_off000083e7.bin
cd82fd057618e61f88de5dcbfbdf8dcaa9884b2739de6fa529a9953be94575dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E7 18700 bytes

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