Malicious PDF — malware analysis report

Static analysis result for SHA-256 9809dbdfe19f7abd…

MALICIOUS

PDF

33.0 KB Created: 2021-07-04 17:52:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9a454ff441353297d97da10be7f6ea2b SHA-1: bd79ce2a2cf9ce5ea5f9b2d27f29cbe3cf4b4c24 SHA-256: 9809dbdfe19f7abd33116e5709a333d006f2d6bad073b1f28c972b5e93a2f54f
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/free-robux-no-human-verify-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/zoo-tycoon-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-zombie-attack-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hackear-roblox-gratis_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/nuke-hack-roblox_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_off00002c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C23 21464 bytes
SHA-256: c68682df40d60ac171cdb920851fcde3c05cc0e00ed72db466cbef57002ed50d
font_01_sfnt_off00005af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF5 19412 bytes
SHA-256: 54327e069fe8aee8a1f9c86c3e3ab55b96abeaa3698aab69d5a1c80f08638ce8

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