Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1f9e77f1f5dbf6…

MALICIOUS

PDF

32.9 KB Created: 2021-07-05 04:45:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 128d87664a391567e20b02d93009e7ba SHA-1: 6a02821799a8d44f060020b24b59cc0abf4d8a97 SHA-256: 0b1f9e77f1f5dbf659b9cc6d0125a1c143e2df1ed3dc31556b5d3098744801d1
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/479516143/wurst-game-hack PDF link annotation
    • http://library.asih-husada.ac.id/repository/roblox-pokemon-brick-bronze-hacked-version_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-robux-2021-by-uing-inspect_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/proxy-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-connect-to-xo-s-hack-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-games-for-free-please_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-cheat-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-rare-accounts-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-asset-downloader-free_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/good-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/17-free-knife-codes-on-roblox-murder-mystery_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-online-free-sign-up_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-websites-that-work_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_off00002e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5D 21924 bytes
SHA-256: 26c039e6ce9261dcbf65c7d5dcdcacc884920b225f25d65b82e53aac2bb2511f
font_01_sfnt_off00005e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E55 18072 bytes
SHA-256: bfe640fece8ec17f9f1aab4c59e3302c849608263b50329376eef2517c23199e

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