Malicious PDF — malware analysis report

Static analysis result for SHA-256 228935a0d63932b6…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 23:00:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 62c91320247858cfec3ba8a351a21e8f SHA-1: 3785e5accb494b0c5d09a19338f6cf4039e853ad SHA-256: 228935a0d63932b62132154dfae1a438598704dcdc57eb9e1ac502b026148230
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/hack-avatar-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-engine-commands_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-how-to-get-every-emote-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/is-pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/www-roblox-com-cheat-in_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-call-of-robloxia-5-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-working-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-insert-scripts-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-mod-apk-de-roblox-2_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-admin-commands-on-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/welcome-to-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-i-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-indetectable_GM431946152.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
stream_002_off00002e79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E79 22628 bytes
SHA-256: 0abb4a7725781fe5d1c7e4d98ef19ea74ef63a6e42764ebaa873667b3e5df759
font_01_sfnt_off00006110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6110 18292 bytes
SHA-256: 15fe832cb1a67f8b9b32bd16fa6b944b1b609e54d644db6923f8635996eddc7f

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