Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e85712817bf7fae…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 05:13:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9188a770ffb82e774060782328e6fb3c SHA-1: c1ca65397f764d18630024f5a8b4307e7609d0e8 SHA-256: 8e85712817bf7faed0590e09e5336750267f203e1170c1fa2a92f5d9e5da64aa
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/websites-for-robux-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-the-doge-package-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-accounts-whit-gamepasses_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-cheat-engine-and-ccv5-bypass_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-shirt-templates-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-a-hp-laptop_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheat-engine-roblox-games_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_off00003297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3297 22084 bytes
SHA-256: 3c299b785b5b20b6ba38db2b69d14d93a000a35f2d62a910eb1451a8046d9045
font_01_sfnt_off0000639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639A 19136 bytes
SHA-256: 0efb9ad38cdb6f9f681febee216806226f9714dffb94f25e4a6b4ea55d3eee9d

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