Malicious PDF — malware analysis report

Static analysis result for SHA-256 225c4cb17adad574…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 08:25:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bf9fb2ca1ac7acc5b614d45a58221a77 SHA-1: b672ff3647f57d2c0d672e9da43799b089fb9c44 SHA-256: 225c4cb17adad5746a54163f35de2e1d49ba05ab54bf06996f8581bde23c62f4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux' and game hacks to entice users to click on embedded links. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://netcdn.online/app/431946152/free-robux-hack-game-hack, which likely serves as a gateway to malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/free-robux-hack-game-hack PDF link annotation
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://perpustakaan.poltekom.ac.id/repository/get-free-robux-gg_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
stream_004_off00004ef6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EF6 30236 bytes
SHA-256: e3ba6d69da0d0c6badac8b446d6fcfe28e48c38014e745fe7859025124497b8a
font_01_sfnt_off00009240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9240 18412 bytes
SHA-256: 8090616d8a5c0701bec53dfbbcc7430816d9db69864bd7c9067c717eb12c26b4

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