Malicious PDF — malware analysis report

Static analysis result for SHA-256 45df84a6f4bd05b0…

MALICIOUS

PDF

35.5 KB Created: 2021-06-28 15:38:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62396e8ba761d815c28a400ccead8a69 SHA-1: 2ea29d9c7963e539f39365a193628aa80badd446 SHA-256: 45df84a6f4bd05b0439f77dfe5758ca756f8d71d3569fa3451f698486fe62021
142 Risk Score

Malware Insights

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

This PDF document employs a lure of 'free Robux' and game hacks to entice users. It contains numerous external links, including a primary redirector at http://netcdn.co/app/431946152/how-to-get-free-robux-no-voucher-no-money-game-hack, and a large number of links to other PDFs hosted on pustaka.ffarmasi.unand.ac.id. This suggests a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious or scam-related content. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

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.co/app/431946152/how-to-get-free-robux-no-voucher-no-money-game-hack PDF link annotation
    • http://pustaka.ffarmasi.unand.ac.id/repository/el-pacmero-hack-roblox-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/roblox-vip-server-free-link-vehicle-simulator_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/free-roblox-group-maker_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/how-to-do-robux-hacker-cutestat_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/bubble-gum-sim-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/free-roblox-csgo-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/cool-roblox-costumes-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/how-to-download-roblox-on-pc-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/how-to-hack-into-somebodys-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/free-roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/how-to-hack-bedwars-2-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/how-to-get-free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/free-robux-gift-card-codes-not-used-october-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/get-free-robux-without-survey-or-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/roblox-flight-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/how-to-hack-admin-on-roblox-games_GM431946152.pdfIn PDF document text
    • http://pustaka.ffarmasi.unand.ac.id/repository/music-hack-2021-roblox_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_off000031d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D1 22516 bytes
SHA-256: 41dcf22988eba1a3880d6e075073d932e5e52d245c3cf29651696f9cd0d7a09f
font_01_sfnt_off000063e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 19660 bytes
SHA-256: 0ad515abd859f59d49a2702f8cafccd6ebf2bfa42c1cf986cd6657e415e36f00

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