Malicious PDF — malware analysis report

Static analysis result for SHA-256 58503964ab6cb37f…

MALICIOUS

PDF

43.0 KB Created: 2021-06-13 22:36:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c823a766b1b13be37b7e6529140bd0d SHA-1: 113632c73fbb33994f2223d64befd8b818a5883f SHA-256: 58503964ab6cb37fa3fa8d7f94767b85cecdd3ca10cd9cca7e023d234761ecc4
142 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including a large number of external links designed to appear as SEO content, and a direct instruction to disable security software. The document body and extracted URLs suggest a lure for downloading game-related tools or hacks, which is a common tactic for distributing malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a high likelihood of it being used to download and execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/roblox-tab-font-free-download-game-hack PDF link annotation
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-cheat-engine-table-08-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-use-hacks-on-roblox-no-virus_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-instantly_GM431946152.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_off00004b08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B08 24652 bytes
SHA-256: e6574b606f0949935f0bfd3c1b5af4a9dcd423601343a08ebcbb5217f0f98452
font_01_sfnt_off000083f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F6 18788 bytes
SHA-256: 9bc502383b7e8f1cc436f64894e2895e2750d08207427c2bb3fae05fc67410c9

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