Malicious PDF — malware analysis report

Static analysis result for SHA-256 6665f599d9b3f0b5…

MALICIOUS

PDF

46.4 KB Created: 2021-05-17 00:01:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8177f3e444e5fedd2166dad15bd2bf42 SHA-1: 940d07390369b4845f5a8aba311ff02c93aee660 SHA-256: 6665f599d9b3f0b563b7ee3706f0a9cc78bb8bb5aa37588e338c939fc51be19c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious payloads. The document body and extracted URLs suggest a lure related to game hacks and free items, indicating a potential phishing or malware distribution attempt. The presence of a PDF link farm heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/roblox-hack-download-pc-game-hack PDF link annotation
    • http://empresa-venta.hr/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-get-minecraft-for-free-2021_GM479516143.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_003_off000049ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AC 25776 bytes
SHA-256: f6ec3234e63acf8d114b3214e4e6a429351fc382ef4eb51e9e14c541660466f6
font_01_sfnt_off000085dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85DC 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9105 18844 bytes
SHA-256: 78e662fc8066b17092395b08137e99af0342e3f29fa403ad8e1f9446b0d64eeb

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