Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d7d19432f95abb…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 20:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6912b49b481af0c31d35eb627a8e38bc SHA-1: 2c51f8701781fe426998b64dfa3df0970f027553 SHA-256: f8d7d19432f95abb2d7118e25a532ad6da806ab0fd6f6400f664f405b72595ff
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 0.9864

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-on-ipad-game-hack PDF link annotation
    • http://www.rewaqousha.net/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/haktuts-coin-master-free-spins_GM406889139.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_off00004e05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E05 29028 bytes
SHA-256: d45411a178c67135362e72de2277bef49cb23501769dd6baa4647c04f93f3482
font_01_sfnt_off000090bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BB 18592 bytes
SHA-256: 4ae05b13a8d3623fc8be9d582b03374b6da1b7c2137e59ff761560f156580baa

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