Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d750bffb8bf2d4…

MALICIOUS

PDF

34.3 KB Created: 2021-06-20 11:48:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51164e8ff01299880693482a068c2ba7 SHA-1: d6396198b581231e3826551534c21c4ee04e8d20 SHA-256: 35d750bffb8bf2d43d5bee0f97406accdfa7cb359dfc31e003644bb4196cf6a2
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/free-clothing-apps-in-roblox-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-hack-2021-pc_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-pc-version-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-paintball-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-free-download-uptodown_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/demon-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/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_off00002fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA6 22100 bytes
SHA-256: bd90989f19878dab784a03b1fe1f6186394a8d1055c8f81efded5fe42f2c884e
font_01_sfnt_off000060bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BC 19216 bytes
SHA-256: 310c0a0c84a378ccfeeae44cbf2a55cd2a0d73da8c29ba1b0c6b4b856e8ba133

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