Malicious PDF — malware analysis report

Static analysis result for SHA-256 c902c7718747769c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 15:20:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6865dce51ec524b51bf3b7c4e6546ea5 SHA-1: e44057d219f1ef88be4c21b561d82691ddcece9f SHA-256: c902c7718747769ccfa96d46b10799e106bf088d8b47fe307c9d755f85e820c6
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/free-robux-generator-no-human-verification-game-hack PDF link annotation
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-put-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-free-accawt_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-hack-weight-lifting-simulator-2-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/play-roblox-as-a-guest-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-murder-mistery-radio-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/without-pokemon-go-free-evolution_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/vpn-for-tiktok-free_GM835599320.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-crash-server-hack-script_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-adopt-me-how-to-get-free-money_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/google-music-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-hack-download-level-dragon-ball-final-stand-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-hack-into-anyones-account-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-free-computer-game_GM479516143.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
font_00_sfnt_off00003170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3170 21772 bytes
SHA-256: bf1f62e14d1650e88a9b6bf10ce126f12865d91d69cabb872139207b5d598a8c
font_01_sfnt_off00006163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 19336 bytes
SHA-256: 1e7a5ee1c2d4ea33325644fd63b1f7e257f54daacec13fb4b037f0c912b7aa4c

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