Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1099ae16eda051f…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 20:48:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dee597d41cf5042f20091b5c29d7589d SHA-1: 9e6a176e3241063083f6876657c44be42ef5ae20 SHA-256: d1099ae16eda051fdc15a40d7d74fc56484de91bdd2bb43ab0485380bdf8f945
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious workflow designed to redirect users to potentially harmful content.

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/cm-free-spin-link-today-game-hack
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-email_GM431946152.pdf
    • http://perpus.i2s-learning.com//repository/roblox-games-with-free-radio_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/free-exploits-for-roblox-2021_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/how-to-hack-roblox-accounts-kid_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/free-robux-no-offers-no-verification-no-surveys_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/coin-master-daily-spin-link_GM406889139.pdf
    • http://perpus.i2s-learning.com/repository/ping-booster-free-download-for-roblox_GM431946152.pdf
    • http://perpus.i2s-learning.com//repository/free-robux-without-human-verification-real_GM431946152.pdf
    • http://perpus.i2s-learning.com//repository/coin-master-cheat-codes_GM406889139.pdf
    • http://perpus.i2s-learning.com/repository/free-robux-2o18_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/como-poner-hacks-en-roblox_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/coin-master-hack-apk-download-for-android_GM406889139.pdf
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/easy-how-to-get-free-robux_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/what-is-bad-about-roblox-free-models_GM431946152.pdf
    • http://perpus.i2s-learning.com//repository/coin-master-tricks-and-hacks_GM406889139.pdf
    • http://perpus.i2s-learning.com/repository/best-pklayed-games-free-roblox_GM431946152.pdf
    • http://perpus.i2s-learning.com//repository/how-do-you-get-robux_GM431946152.pdf
    • http://perpus.i2s-learning.com/repository/roblox-free-candy-van-exploit_GM431946152.pdf
    • http://perpus.i2s-learning.com//repository/code-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000325b.bin
f0060556dd448b2c6bb96809b675cf79909522a587d7d65178d9c9857405a66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x325B 22932 bytes
font_01_sfnt_off000065b2.bin
ab50593e8d9ec91ff316e3914c5f1e57f6a16201982a487eb389823534895425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B2 18852 bytes

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