Malicious PDF — malware analysis report

Static analysis result for SHA-256 973d391437f72cc6…

MALICIOUS

PDF

35.8 KB Created: 2021-07-05 20:14:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a76ee6011a614204a5948faf1eebb2f9 SHA-1: 1a347c5fdf5a7af8e7df4f1a4193e605cd806880 SHA-256: 973d391437f72cc652a5d294a7f85a7e98df666c663730418ec6593e297ca8c6
82 Risk Score

Malware Insights

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

The document body and embedded URLs promote a lure for free in-game currency, specifically mentioning Roblox. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.tw/app/431946152/how-to-get-free-robux-without-email-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/pokemon-go-free-and-nintendo-switch_GM1094591345.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-without-using-apps_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/id-that-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-skywars-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-400-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-do-you-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-hack-the-streets_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/mad-city-roblox-hack-pain_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
font_00_sfnt_off000032fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FA 22500 bytes
SHA-256: f9093be4d61f2547e3867c2e113fc3376651630ac6705f2b6a3b063b54617427
font_01_sfnt_off00006501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 19800 bytes
SHA-256: 7cc36b060554649fa6389e53221d06b2ae285b8e0623c743bba4dd7e0ab481d9

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