Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66f2a63098c40ae…

MALICIOUS

PDF

32.1 KB Created: 2021-06-25 13:36:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3d0eca55f1b724dae22c54e05df6f337 SHA-1: e3afe8e79c0e862a434c5692ef99a9745e403d2c SHA-256: e66f2a63098c40ae9daa5e67996eefe7752097287390ce5d74a3f196e533c1f1
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 0.9824

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/roblox-pets-for-free-game-hack PDF link annotation
    • http://zercalo.org/images/is-tiktok-app-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-now-easy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/works-how-to-get-free-robux-2021-fast-amp_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-vidoe-star-egg-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/tiktok-free-view-iphone-6s_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/simple-roblox-hack-scrpits-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-be-spongebob-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/this-game-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/jj-roblox-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-paintball-rank_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_off0000287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287D 21980 bytes
SHA-256: ce7e4103bf1da4ef79962add78ae0f30006c1c97d13e75fd1cd8be46dfd4fad8
font_01_sfnt_off00005900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5900 18908 bytes
SHA-256: 42387686cd6df9768ab9b03c4001a51af471fdc2e126ae3ea2715af73e59f8f9

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