Malicious PDF — malware analysis report

Static analysis result for SHA-256 439a52a14828828d…

MALICIOUS

PDF

43.9 KB Created: 2021-05-11 14:06:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fe50aba99571c7ca47880df3d8f61d56 SHA-1: 1ae55b6847b94ffed2ad2c001b066ee33915aa64 SHA-256: 439a52a14828828de053c4cdbd545a50600de2fc0b125b28cf26e005ad49b6f3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external PDF files and a primary URL, suggesting a link farm designed to distribute malicious applications. The document body and heuristics indicate a lure related to game hacking, likely aiming to trick users into downloading malware disguised as cheats or tools. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/hacking-apps-for-roblox-game-hack PDF link annotation
    • http://www.duchidicastelluccio.it/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://www.duchidicastelluccio.it/images/coin-master-hack-app-ios_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
stream_003_off00004c19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C19 26396 bytes
SHA-256: f4feee411de02164319026a7b0c468fb8a5122f22d3c93830fa457940bda25af
font_01_sfnt_off0000875b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875B 18932 bytes
SHA-256: a12a900017875743d46ad83be25c63e25fa00e3014bd6d438c4b8f248ab77b0b

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