Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dba0943fc32f93f…

MALICIOUS

PDF

35.4 KB Created: 2021-06-20 10:38:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 342b6f6c09da3e27956988320d1f0755 SHA-1: 748d0f5139df0bac523ac485c5fc2e805fe32052 SHA-256: 4dba0943fc32f93f84f4247fd4baef2ee4d14b9a00789dc921c6782d95362b31
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.co/app/431946152/gift-card-roblox-free-2021-game-hack PDF link annotation
    • http://perpus.i2s-learning.com//repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-instant-no-lie-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hacking-into-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-hack-2021-proof-no-inspect-element_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-hack-robux-2021-unlimited-robux-and-tix_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/v3rmillion-free-robux-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-pizzeria-roleplay-remastered-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-game_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-1x1x1x1-hack-crazy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hack-arsenal-roblox-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_off000032f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F8 22164 bytes
SHA-256: ae3d8cd0c7cedebf3d2993df19cc2e44cb6df489d640574fb496bff92feb10a8
font_01_sfnt_off00006414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6414 19452 bytes
SHA-256: 75e47349fa778616358f76a182329315119d6ffe602a7b5a8814dab786d82067

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