Malicious PDF — malware analysis report

Static analysis result for SHA-256 5590cf9538370e9f…

MALICIOUS

PDF

46.1 KB Created: 2021-06-10 12:28:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2930db617e98c31d7b33266031bae6e6 SHA-1: cd1d4b3b0bb38d765623af2f0a4d09ea2914607c SHA-256: 5590cf9538370e9f3bc4806e2866d25c6de6438f56b244eb618b7cd132f29576
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains numerous embedded links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of a "Free Robux" theme and a "download button" heuristic indicates a lure to entice users to click on these links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to distribute unwanted content or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/gameblock-free-robux-game-hack PDF link annotation
    • http://www.eptaviation.com/images/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/is-tiktok-free-to-install_GM835599320.pdfIn PDF document text
    • http://www.eptaviation.com/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/free-100-dollar-gift-card-roblox_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-to-execute-a-script-with-admin-roblox-free-admin_GM431946152.pdfIn PDF document text
    • http://www.eptaviation.com/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000584a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x584A 24536 bytes
SHA-256: 7c84dc1d847d9fb2d903fea196594c35b3187d914bbff060b16e884aaaa00221
font_01_sfnt_off00009087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9087 18744 bytes
SHA-256: ad1ee777353a20c56abe3fbf10bc5a4a289178934dc27ef3cd5abea690021e42

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