Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef988cb983715f4…

MALICIOUS

PDF

35.6 KB Created: 2021-07-07 15:00:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a050d1a322b500e41d80bee1db0d523 SHA-1: 1680c0baa027298bde5536509400ae03cb16acc6 SHA-256: 6ef988cb983715f4d3b72a63a8b0d3d2343bb234ece0b1521e1d5a7613a673d0
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-online-free-spin-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/pubg-uc-via-easypaisa_GM1330123889.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/original-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/youtube-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/buzz-the-bee-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/hacking-event-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/are-you-allowed-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-complete-free-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/generate-free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/my-roblox-girlfriend-cheated-on-me_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-spins-download_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
font_00_sfnt_off000035a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A8 22884 bytes
SHA-256: 5deb91fc4ce99968448f98c20bedad745dbd2b9acf6da6da47c2df47b2520575
font_01_sfnt_off000068ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 18248 bytes
SHA-256: 219756382ff6256e60ec1326728dd0e07af79f7e300a248e9a054b936f27f57f

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