Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e480dc2d22fda1…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 17:11:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 715bd09d0a9884f3578501a0aa4fc7e4 SHA-1: d822303d99de24eabedb384e11b0883439cc4f66 SHA-256: b4e480dc2d22fda17bcf42394b9f1f34c7c5ab765ab99752ebd8e8462259de54
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-verification-2021-game-hack PDF link annotation
    • http://www.adudubai.com/uploaded_files/userfiles/files/stickmasterluke-free-robux-obbys-link_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/hack-de-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/how-to-get-free-items-in-roblox-tagalog-2021-febuary_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-new-have-county-hack_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/game-action-aventure-magic-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-hackear-ordenadores_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-bubblegum-simulator-cheats_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-twisted-murderer-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/cheat-qui-dupli-sur-roblox_GM431946152.pdfIn PDF document text
    • http://www.adudubai.com/uploaded_files/userfiles/files/roblox-gift-card-online-free_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_off00002f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F26 21980 bytes
SHA-256: 9d2a612d1842410f11592572963bc47110955db37107a10884ee5f40af14f47e
font_01_sfnt_off00006003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6003 19476 bytes
SHA-256: 0ea569e2458714af2fc88272f668bb9559ca065cecd410792851a624a05e4648

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