Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2521cd9c34ed2e…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 08:11:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 868815d99373e28aad6b39facce0ad36 SHA-1: 2144d7760522317f600e76ecfd771b396da4354b SHA-256: 9d2521cd9c34ed2e470adf148928e51cfd472709548bcb927aecbb314f8b8673
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract traffic. The document body and extracted URLs indicate a lure related to obtaining free in-game currency (Robux, spins), a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/how-to-get-billions-of-robux-for-free-game-hack PDF link annotation
    • http://tc-kulmbach.de/images/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-hack-on-club-boates-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005253.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5253 24920 bytes
SHA-256: 591086b92e36cd92195c5b17bece57a8049a13658993e0621d34c191350c5254
font_01_sfnt_off00008b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B15 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000094d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D6 18476 bytes
SHA-256: 66d8c5846d4a90918a0937a46ce09e52e93e3664904dbe228235a2ae5a504d56

Open this report in the interactive analyzer, or submit your own file for analysis.