Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8cd41772cb518d…

MALICIOUS

PDF

51.6 KB Created: 2021-06-11 04:07:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dab6a0cf62a3ac38f3854d84aefa6901 SHA-1: d9d0a77dd9c90fecf8de06dbb8af191077499c94 SHA-256: 0d8cd41772cb518df046ea8602f150920c1ad1b64e9a0a0d31cb39638dbe67f7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to websites offering free Robux and Coin Master spins, indicating a likely phishing or scam campaign. The heuristic 'PDF_SEO_LINK_FARM' specifically flags the presence of a mass external PDF link farm, reinforcing the malicious intent. While no scripts were extracted, the document's structure and embedded links strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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.tw/app/431946152/roblox-link-free-robux-game-hack
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id/repository/get-free-robux-download_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/how-to-hack-a-roblox-account-2021-november_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/robux-free-c_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-500-spins-link_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/all-roblox-games-you-can-hack-with-cheat-engine_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-no-human-verify_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/roblox-free-robux-obby-limited-time-only_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/robux-for-free-2021-no-vertification_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/80-free-spins-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://repository.ummy.ac.id/repository/free-robux-easy-robux-today_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e0.bin
36a4ec21d0ad050134b27a707ab184c4f2cb3331c1e1780e4f34fd403be545cd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E0 28016 bytes
font_01_sfnt_off0000902f.bin
94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x902F 2824 bytes
font_02_sfnt_off000099d9.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D9 5596 bytes
font_03_sfnt_off0000a681.bin
6524df72ee07d0c20a7d4abeb9879c268355d99804979e8207d81ec6c0fbe6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA681 18380 bytes

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