Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b93ce09819b2b69…

MALICIOUS

PDF

36.5 KB Created: 2021-06-25 22:02:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6fb9f0d8281901bf315fd07db8176f2c SHA-1: 676db02d322f7ff5021112dd960f7db98a58de03 SHA-256: 5b93ce09819b2b69ded20f0d32d435795d7738ab97ae18e3b7760b15bfed01b3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links disguised as a 'free generator / game hack' lure, aiming to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the presence of multiple SEO-optimized PDF links suggests a link farm designed to distribute malware or phishing content. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious download or redirection workflow.

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.co/app/431946152/free-robux-and-tix-generator-2021-game-hack PDF link annotation
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-actually-get-1-000-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-hack-script-give-item_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-hack-extreme-nijecotr_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-counter-blox-skin-free_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/hack-roblox-pc-download-scripts-no-noclip_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/were-are-safe-whitelist-roblox-hack_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-without-doing-anything_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_off000035a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A0 22700 bytes
SHA-256: 4e535a42695d1b5c96be9bb73fba38547f414dfc33a5172a8ffb2fcd9d8990db
font_01_sfnt_off0000685f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685F 19516 bytes
SHA-256: cb7d0e0d560f0094611ce6edf85a8cda10decf57509cba65b5950ef76b68ff9b

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