Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c5c01a0d7017aa…

MALICIOUS

PDF

43.6 KB Created: 2021-05-11 17:02:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f3afde4e5e510080110f1a2131e8b7d SHA-1: 37e380a104b0e9b62dcc10b31aa16ab5880e2a7f SHA-256: c7c5c01a0d7017aacb227eb1fc17b6119ef87a0458862375725dec1d29f15171
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, designed to lure users to external sites offering in-game rewards. The primary URL and numerous others point to sites promising free spins for Coin Master and Robux for Roblox, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/coin-master-free-spins-link-2021-game-hack
    • http://repository.ummy.ac.id//repository/easy-ways-to-get-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coinmaster-spins_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-coin-master-free-spin-link_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/daily-free-spins-coin-master-app_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-roblox-svg_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/rbxoffers-earn-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-daily-rewards-link_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-download_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-hack-spin-link_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/flip-master-coins-hack_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/microsoft-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/robux-generator_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-apk-hack-download_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/download-coin-master-hack-mod-apk_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-33-download_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/daily-free-spin-and-coin_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b0b.bin
1d5fd8b2fca95465b3c4cdce5075aadef4897617d28b9f271e0fbfd880aa8c5f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0B 24708 bytes
font_01_sfnt_off000083a8.bin
52ccdddb3421a676568b5a64b225da64cfd7cfefe739c109a0b3fc8a2462147a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A8 19784 bytes

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