Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a07038fe35a5aa4…

MALICIOUS

PDF

33.5 KB Created: 2021-06-23 16:37:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ea04cd22dae027fed9926198a50f3009 SHA-1: 35030c5ab0952345038f8f9f11269ddfdf8f8d08 SHA-256: 9a07038fe35a5aa44444772755dc47331e9f7dd9edf92edeb8217259a0c84056
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files promising free in-game items. The presence of a direct download URL and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful content. The document body and extracted URLs strongly suggest a lure for free Robux or Coin Master spins, a common social engineering tactic.

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.co/app/431946152/youtube-roblox-free-robux-hack-game-hack PDF link annotation
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021-on-computer_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/robux-claimer_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/trolling-with-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-get-free-robux-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/robux-only_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/pokemon-go-free-999_GM1094591345.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-hack-roblox-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/genarater-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://sparkthis.org/ckfinder/userfiles/files/easy-way-to-get-free-robux_GM431946152.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
font_00_sfnt_off00002eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEA 21240 bytes
SHA-256: f5d623553730a18a175e0e5a14f71b05371a826ec1c19c014d3ff267e5597a3f
font_01_sfnt_off00005d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D41 19228 bytes
SHA-256: 7d5eab6fcfa9c85f06d06234afcaaaf988c8f5f788507ed3c3d191e23a0aba2f

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