Malicious PDF — malware analysis report

Static analysis result for SHA-256 f899f5c71350f9f9…

MALICIOUS

PDF

34.1 KB Created: 2021-06-27 02:03:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fa8678a98e5af68fc05b336ef6f7cc08 SHA-1: 64585b2572db6f59a123251d854ab8d983c3b640 SHA-256: f899f5c71350f9f9e65568f01dcd3293dbaeb9504274fa1df891a22a7d25bd35
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/get-me-free-robux.com-game-hack PDF link annotation
    • https://lib-stie.yai.ac.id/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/phantom-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-hack-no-survey-no-download-easy_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/get-free-things-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-now-for-free-robux_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hack-tool-2021-download_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-zombie-attack-hack-script_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-hackin-anybody-account-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/coin-master-hack-without-verification_GM406889139.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_off00002f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F07 21852 bytes
SHA-256: affc9134d91058f018b9c8aa08cd5efb4df25259a8f2f4ea502b5d9ab5eab6e2
font_01_sfnt_off00005f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F61 19344 bytes
SHA-256: be31474e595ca67d75e137dcd21c1d1ae2f1a3a485a1871862f588f8aad36912

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