Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e41fc082370b02d…

MALICIOUS

PDF

35.8 KB Created: 2021-07-02 06:08:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0aed6921bdf9adeba1ea4e065bc897dd SHA-1: 6e98bb791ef7b12dddda78152ec7b08a4acd14da SHA-256: 6e41fc082370b02d87cf875b5fec6c572e94914f112301a34a3657f324549e99
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.co/app/431946152/cool-free-items-in-roblox-game-hack PDF link annotation
    • https://razredna-nastava.net/files/free-robux-pastebin-may_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-cool-free-skins_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-robux-live-stream_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-now-get-it_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/pastebin-roblox-vip-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-hack-exploit_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/prison-breaker-16-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/www-mistplay-com-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-cards-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/elts-hack-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347C 22560 bytes
SHA-256: e1bdb236a4a8d08a3360a3330619e5efb9aff32a81d8bc5cf2963b83be84db5a
font_01_sfnt_off000066f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 19016 bytes
SHA-256: 93194ce65f1f06b47d900096dda4a90a2260e314028aff32a82c22caa1701605

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