Malicious PDF — malware analysis report

Static analysis result for SHA-256 408b667907cc110d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 01:43:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d4809c814dba72cacb40151fdc8380aa SHA-1: d0c31eb7b821eeaafa61aaab704f941d6072ecdf SHA-256: 408b667907cc110d165dd4b2ccd50f07c1b87e9692326b765af3fa6f5656b521
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/coin-master-free-spins-link-today-new-game-hack PDF link annotation
    • http://rgadventure.com/userfiles/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-coins-coin-master_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_002_off000030a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A1 23592 bytes
SHA-256: 7d43e49ebf7c16679e47df0ccaee77274f33c0402c2520fa70392896cccac21d
font_01_sfnt_off00006642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6642 18864 bytes
SHA-256: c2b00cda6ccae936c285d4a8f1a252405c0779bc4d7804dfd8560043eb77b64f

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