Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9b4518f3e267b9…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 13:30:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 82807b74efd87b8c93153a6f81525514 SHA-1: ba8494613bc9a359dcf89c6e526edecd5cfa68b2 SHA-256: 3c9b4518f3e267b91a07d7142bc280ddbebdb16e6c5ca1a31f4d15e8657bf416
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/431946152/how-to-get-free-things-on-roblox-game-hack PDF link annotation
    • https://beauty911.tw/upload/files/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/objet-gratuit-roblox-hack_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-do-u-speed-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/roblox-mods-free_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/medieval-hood-of-mystery-roblox-free_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/roblox-meep-city-game-free-download_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/synapse-x-best-free-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-to-be-a-vip-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-deep-web_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/passwords-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/download-for-roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-ohne-human-verification_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/oomg-how-to-hack-jeailbreak-on-roblox-with-proof_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-generator-no-survey_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_off0000374b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x374B 22400 bytes
SHA-256: ad07297a0c7db18116cd603f32905aaf808da4f402061de2694e048bce53afa1
font_01_sfnt_off000068ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CE 19204 bytes
SHA-256: b68b932afa1663feb9665ea06d56ff2102cae43e6122537b425140c4e8bc7904

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