Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed7c2b8336b0b0…

MALICIOUS

PDF

37.3 KB Created: 2021-05-24 14:35:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a8a77e7e039c26dc295f89cfa7f95937 SHA-1: ee517807743882770290d10513959133ed36dcc3 SHA-256: 91ed7c2b8336b0b08418223bc0b1af0c2edb4529c20c72f4a4cfb2550624980e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document uses social engineering lures, such as "Free Minecraft Server Maker" and "Free Robux Generator", to trick users into clicking embedded links. The heuristic "SE_CLICKFIX" indicates the document likely instructs the user to execute a command, a common tactic to bypass security measures. The presence of external URIs and the ML classifier's high confidence score suggest the document is designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 4

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/free-minecraft-server-maker-game-hack PDF link annotation
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://pustaka.manajemen.fekon.unand.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_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_002_off0000358b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x358B 25960 bytes
SHA-256: 4c0af1c442be4358174f86f1ea4bfae9f6782982aa0383beaf88c6c56abd6c2e
font_01_sfnt_off000071cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 17852 bytes
SHA-256: a2113846211f941d41962086a33418b46c13efddcea93467eebdb757cad7d920

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