Malicious PDF — malware analysis report

Static analysis result for SHA-256 724cbbbc99380a3e…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 21:04:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 18e4c4a1676e50dc2ef9dcafb18281b9 SHA-1: 17aa484cd27fac774986cf5716d1903b3b04757c SHA-256: 724cbbbc99380a3edf1a04ed32b3b14670100f7e206bec8050e8bcfcdbca6741
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 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.
  • 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.
  • 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/479516143/minecraft-sign-up-free-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-promo-codes-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-steves-one-piece-hack-tp-chest_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-pc-2021-not-patched_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-robux-hack-on-computer_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-royal-high-school-diamonds-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-accounts-with-builders-club_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
font_00_sfnt_off00002fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEC 21952 bytes
SHA-256: b5f1bbf789b5f73ee8bb1fd74fd56e2ec040ee8b3bc15f4195cc185852549f65
font_01_sfnt_off0000600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 18220 bytes
SHA-256: 6236314a17f57ecfc4f63da4a6b9cb2d9143cd94f6dcae1b1ce204d4da3deb21

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