Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5cd1fed3077da6…

MALICIOUS

PDF

33.7 KB Created: 2021-06-26 04:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 77eb3acc3f36f8fa28224d62721b49d5 SHA-1: b5e5d91c298036d7ed9d2b277b92d4fedd75a2f8 SHA-256: 8c5cd1fed3077da635efaf216e1046a8dbe19dafebe2b7600c97e91d042a5964
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. It contains a large number of embedded URLs, including a primary redirector at http://netcdn.co/app/431946152/free-robux-made-by-roblox-game-hack, which likely leads to a malicious download or phishing site. The heuristic firings indicate this is a link farm designed to attract users searching for game cheats, and the ML classifier strongly supports its malicious nature.

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/free-robux-made-by-roblox-game-hack PDF link annotation
    • http://stikespantirapih.ac.id/home/repository/hacks-for-falling-that-actually-work-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-bloxburg-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-how-to-look-like-a-hacker_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-shirts-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-level-7_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-packages-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-give-yourself-free-robux-in-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/duck-roblox-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-mad-city-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_off00002e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1F 21776 bytes
SHA-256: 26ac340c9c5b93418bfc62f252ef4dce3f1466508e458070e2582c7238acc7ca
font_01_sfnt_off00005ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDD 19340 bytes
SHA-256: b700c0ee6f68e903a504a86ac5483de96dc2af47738efc73071322d002bf8754

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