Malicious PDF — malware analysis report

Static analysis result for SHA-256 710d791c0bed87e0…

MALICIOUS

PDF

34.5 KB Created: 2021-07-10 01:19:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 45694a85b3c1210102cb0b55fd442f65 SHA-1: 2ec0d994b944807ac3aa7d8a563a8c2c2cc5618c SHA-256: 710d791c0bed87e0cf1fe71f287c4739fde35be46f3c72e5fd37fd4a4f12ba57
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/roblox-admin-hack-game-hack PDF link annotation
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-cheat-engine-debug-roblox-without-crash_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/getting-my-roblox-account-hacked_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/comment-hack-roblox-unboxing-simulator_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/bux-gg-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-for-macbook-free_GM479516143.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_off000030a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A5 22140 bytes
SHA-256: 9cc471d22612fd917a8c314722c734a21d8951523ded91a4c2f1db6ba8ca9b90
font_01_sfnt_off0000617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617F 19208 bytes
SHA-256: e5ca730804d66bebf4e5e52c5751bcc2b57707170b28c3b0ce40a6afaace4474

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