Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0f1b9ef684863f…

MALICIOUS

PDF

39.5 KB Created: 2021-04-29 09:08:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aad0fd171d87afd19fcfd88793a2c6d1 SHA-1: 2603b5a820c0438b2f2da62e6c691ea83622f75c SHA-256: 0c0f1b9ef684863f8411adf6d80bd909a1eb1901cc41a1283668aba086b22c7d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple invisible links and visible calls-to-action, such as 'CLICK HERE TO ACCESS ROBLOX GENERATOR', that lead to URLs promising Roblox hacks and free currency. These links likely serve as a lure to download malicious payloads or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of numerous suspicious URLs supports a high confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/hack-roblox-2021-pc-game-hack PDF link annotation
    • http://www.library.smactf.sch.id/repository/roblox-script-pack-for-games-2021-free.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-do-you-get-a-free-robux.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/how-to-get-2021-robux-for-free-2021.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-robux-no-captcha.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/beta-warships-roblox-hack.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/free-items-in-roblox-today-ultra-rare-and-new.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/star-codes-free-robux.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/roblox-exploit-download-for-free.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/piano-hack-in-roblox.pdfIn PDF document text
    • http://www.library.smactf.sch.id/repository/cheat-engine-speed-hack-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003db5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3DB5 25140 bytes
SHA-256: 0108db136dd516dcb2157ff3a5adca800b8221984cd3ec0ce936e420fad4de89
font_01_sfnt_off000076fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FE 18740 bytes
SHA-256: d749e0f8cfc8dc6b69fef61846d45e06e5024da2ebeb294f3100f6105dfd78d7

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