Malicious PDF — malware analysis report

Static analysis result for SHA-256 e043c65fd997bfc3…

MALICIOUS

PDF

46.9 KB Created: 2021-06-08 16:30:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 17d9a9bbf44ceba1acfaf5345a7b6829 SHA-1: 52e312108a372d7161ad92ad06075486d824e354 SHA-256: e043c65fd997bfc393586bedc3902230843ec99a34a5613dfcc22dc9da95fc8c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to 'free Robux' or 'Coin Master' cheats, indicating a lure for users interested in these games. The presence of a PDF_SEO_LINK_FARM heuristic suggests a large number of these links were generated programmatically to appear as legitimate content. The ML classifier also flagged this PDF as malicious with high confidence.

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/free-robux-jesse-tc-game-hack PDF link annotation
    • http://serviio.org/images/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://serviio.org/images/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://serviio.org/images/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://serviio.org/images/pokemon-go-free-stuff-codes_GM1094591345.pdfIn PDF document text
    • http://serviio.org/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://serviio.org/images/how-to-get-free-snacks-in-coin-master_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_off00005063.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5063 25640 bytes
SHA-256: e759e108c5327906ddf09d45429f88fa0b102a84eb328318ad78ddce8dcff171
font_01_sfnt_off00008b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B28 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000094ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 18180 bytes
SHA-256: 3b56c0a74d8f94e652f889fa36d130ad20dfca95dbb576f83e67da9b75d983de

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