Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c99cb81b8a3920…

MALICIOUS

PDF

45.1 KB Created: 2021-05-14 22:45:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 13fabd31a0085ee9fab6dd05866d3a29 SHA-1: 777d253fa197a649adcda443f79beec8174af752 SHA-256: 82c99cb81b8a39203d1c2118ee07695a251a5ff3fa5c073ba53c91bc0952edd4
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a link farm, and includes lures such as fake download buttons and invoice language. The ML classifier also flagged the document as malicious. The primary URL, https://netcdn.xyz/app/479516143/play-minecraft-online-free-game-hack, is likely the destination for a malicious payload or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/play-minecraft-online-free-game-hack PDF link annotation
    • https://zszolesno.pl/images/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • https://zszolesno.pl/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/best-site-for-free-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_003_off00004cc3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC3 24992 bytes
SHA-256: 9ee92c5d7300229482078391ae53ab33f5b5ffcd3b3aebf55c819990d07c987a
font_01_sfnt_off000084f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F3 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00008edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 17976 bytes
SHA-256: e953997c623ab1bd3546e7b188ca680e36d1015a1cf7f46efbbf98890a47325d

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