Malicious PDF — malware analysis report

Static analysis result for SHA-256 521c1b73dc015a7f…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 22:09:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c6539cb03ada0b220c6d30f766da3a53 SHA-1: a9cbdb5559b0706e781f43d6fef42c5ff1e2a548 SHA-256: 521c1b73dc015a7fd16bdf8d5effc70675754b46cd5642245a80921702a3fe84
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/406889139/completed-coin-master-hack-game-hack PDF link annotation
    • http://bentoking.co.uk/media/storage/editor/files/hacks-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/roblox-cheat-engine-no-download_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/pokemon-go-free-verizon-code_GM1094591345.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-no-verification-or-download_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-games-in-roblox-100-real_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/free-robux-generator-with-roblox-quiz_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-to-hack-roblox-accounts-without-email_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bentoking.co.uk/media/storage/editor/files/how-long-is-the-minecraft-free-trial_GM479516143.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_002_off000034e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34E3 23648 bytes
SHA-256: bdc19b118e41a3ce38b5cc9b76cbb49a4aff764f99e8c69fcf6624006d039ef6
font_01_sfnt_off00006aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 18688 bytes
SHA-256: d314275442e2b498f39cfd2636dfe0c4a5c9291756091703ea36191dc862be71

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