Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3e3dd735080388…

MALICIOUS

PDF

35.0 KB Created: 2021-06-21 02:42:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 342d441fc7515cb22a4f2d022c77ce36 SHA-1: 1c6e1cc3187fa3faa401654f6b36ccb9e57a3a6d SHA-256: fb3e3dd735080388cd68c8472791fb4b80c313c3aa787dd85bf755383bb3e866
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.co/app/431946152/roblox-bee-swarm-simulator-hacks-game-hack PDF link annotation
    • https://ceranique.nl/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/do-u-want-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/vortex-premium-key-free-roblox_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/flame-gg-hack-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • https://ceranique.nl/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/how-to-use-speed-hack-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/roblox-hacks-in-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://ceranique.nl/images/how-to-get-the-tix-beanie-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://ceranique.nl/images/free-robux-websites-that-actually-work_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_off00002fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA0 22668 bytes
SHA-256: 102aa280c41b253bbbb99282508f47acfd74f756194a9061fb436b7f07cca9ae
font_01_sfnt_off0000626c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 19444 bytes
SHA-256: 84b883823283aec507ea0d8b35d33f77750391847892d7d0f31bf90d9c71e4ac

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