Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aead362d4323ce…

MALICIOUS

PDF

48.2 KB Created: 2021-05-19 06:36:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a89d1c9775256ab6a7e5f66bdf9adad SHA-1: 54e711a443a26b3da975292e0c947d3e874d1576 SHA-256: 81aead362d4323ce6c09b5818f08d5aa2a1691c09efa7b13e34f9d48908786c4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to websites that promise free Robux or game currency, indicative of a scam or phishing attempt. The PDF_SEO_LINK_FARM heuristic suggests a large number of these links are present, likely to create a link farm for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML_NYX_PDF_MALICIOUS classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/how-to-get-free-robux-on-phone-game-hack
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/www-roblox-com-free-robux_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-by-watching-ads_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-hack-cheat-engine_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-microsoft_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-hack-coin-master-computer_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/daily-free-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-hack-com_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-daily-spins-coin-master_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-twitter-free-spins_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-spins-2021_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/como-hackear-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-hack-2021_GM431946152.pdf
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-gifts_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000490b.bin
bfe2f314202d5f5e28e1c536a9f826325f15485ce1cff0f43ce09a72b6ffd7d1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490B 24888 bytes
font_01_sfnt_off00008245.bin
c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8245 2892 bytes
font_02_sfnt_off00008c2a.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2A 5596 bytes
font_03_sfnt_off000098d2.bin
4aaa4dd608c1f398ea3b3714e579938e54c8b6ebc42d5b365d603cdfd05c4e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D2 18600 bytes

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