Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cceac335b0fe250…

MALICIOUS

PDF

50.4 KB Created: 2021-06-08 22:03:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7314701770a1f6bea29b288d496a3f45 SHA-1: bfc06df36e727af5896a97fe0cb9708d2a6b6132 SHA-256: 4cceac335b0fe250e3652a2b5228883950d9a4aecb560e480c5a8a18af5277f6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which appear to be generated for SEO purposes, indicating a link farm or content stuffing strategy. The document also includes a call-to-action phrase and mentions password protection for archives, suggesting a lure to download or access further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-stuff-in-roblox-catalog-2021-game-hack PDF link annotation
    • http://librarystkippgribl.com//repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/tiktok-free-robux-hack_GM835599320.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/earn-robux-online_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54F7 27616 bytes
SHA-256: dc2556bbeaebda1ad985c15c5948b3252b946d687053cfdf48ac6c2afc4e6c89
font_01_sfnt_off000094dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94DD 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_02_sfnt_off00009ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF1 19112 bytes
SHA-256: 401013d89bbfb62ff20e7d1b9896e6c08610ebc096b5c655cf9b7538c87d2611

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