Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f33b2776f6d2e49…

MALICIOUS

PDF

45.3 KB Created: 2021-06-03 22:53:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a21109d44a336d05e09ff1413e51f0da SHA-1: b79f4f662f40b3557246785745f8c6948bc902d8 SHA-256: 8f33b2776f6d2e498fd33cd61367b6bcaa3511b5060da8a1491626410efbbd12
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing 'free Robux' and game hack themes to entice users. It contains numerous links to external websites, many of which appear to be part of a link farm for similar scam content. The primary malicious activity observed is the redirection to these external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/free-robux-no-verification-no-download-game-hack PDF link annotation
    • http://opac.stiesa.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/tiktok-free-book-hack_GM835599320.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.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
stream_004_off00004f8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8E 25660 bytes
SHA-256: 6209324e2fa8520a25f868c826708dd8cee164c6cda5caa07b710b5b2188d074
font_01_sfnt_off00008ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 19180 bytes
SHA-256: 529ad809d39cb86513f1fd0a7c59ac13158e8644a31ce1f1c8620f9d5ad40971

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