Malicious PDF — malware analysis report

Static analysis result for SHA-256 d352c91bf5fffdfb…

MALICIOUS

PDF

47.1 KB Created: 2021-06-09 17:19:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a770881f8fd9a0d62fa2018345af4413 SHA-1: f15b08b8b8acb57fb2294638f2b5c0bae8dc84e9 SHA-256: d352c91bf5fffdfb7597a8f6ce7fc031dd68a27a1028f4c132854dccc7f46dbc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external PDF files hosted on domains like hardbit.cn. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. The document body, though heavily obfuscated, contains a URL that likely serves as a lure for users to download or access further malicious content. The presence of external links suggests an attempt to distribute or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/supreme-t-shirt-roblox-free-game-hack PDF link annotation
    • http://hardbit.cn/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-setup-a-minecraft-server-for-free_GM479516143.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_004_off000051b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B9 29704 bytes
SHA-256: bee14c82d76dc07505efda3710c8fe4ccd8375dc8b5b18b777bad8b948e167a3
font_01_sfnt_off000093f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F2 18912 bytes
SHA-256: 360a8c7522f44c7cd5c75aa41dec04b3934a5d4075d2073abb3b85f035eeabb7

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