Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1e2da0e0e29585…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 09:26:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f5698976dc406f888ba18d23d2586283 SHA-1: abcd7f464a179dc1d8e1747b1e168f84dfea30e2 SHA-256: 9b1e2da0e0e2958586e025b3e99cf5734a2c3d52eabf9d045e5ae56981ecc941
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-roblox-adopt-me-pets-game-hack PDF link annotation
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/roblox-download-free-windows-xp_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/roblox-critical-strike-hack_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/hack-roblox-veichle-simulatore_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/roblox-free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • https://padang.indahkonveksi.com/ckfinder/userfiles/files/how-to-hack-a-roblox-game-2021_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_off00002eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFF 22316 bytes
SHA-256: ad5b80c4a709b6bf2dc1f8a958e26a9f3c1f179af455e29fd600247debe25a65
font_01_sfnt_off00006074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 19452 bytes
SHA-256: 7b9be5883f45f02dbb03249ff61d9220e610f7b45a0bb0632252067c450821da

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