Malicious PDF — malware analysis report

Static analysis result for SHA-256 9872f6cf78ce1e4d…

MALICIOUS

PDF

40.8 KB Created: 2021-05-19 13:05:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db806e904235c0fe94d951f6482c7cb0 SHA-1: 736927edc776b8f241f4df5232d87c5f8511fc2e SHA-256: 9872f6cf78ce1e4d70f92babe3d8b0a4a44ea00b89a0eb6e00a37dd2c045ac37
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 0.9971

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.xyz/app/406889139/google-moon-active-game-hack PDF link annotation
    • http://www.bbnest.it/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://www.bbnest.it/images/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://www.bbnest.it/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.bbnest.it/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bbnest.it/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://www.bbnest.it/images/get-robux-for-free-2021_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_003_off0000482e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482E 23968 bytes
SHA-256: 5d5738e8fa9c75cb8f85b6525403e25e3c74e598e2c0c972c33661c1b8379765
font_01_sfnt_off00007e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E49 17792 bytes
SHA-256: aa7c45670f49f00820d994934e7dde26247c468a68d28a524a2967fa5927161b

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