Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c9d6b5a9ee188f…

MALICIOUS

PDF

34.9 KB Created: 2021-06-23 19:36:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c9eab0915f298120ea02aa4639a8996a SHA-1: 8d2e21983939c334f5303469feb044b152d3eb2d SHA-256: d1c9d6b5a9ee188f472a9224b6db4442e01bf8e835161cffb466f875ad410e3b
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/479516143/wurst-18-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-bloxburg-money-hacks-25-febuary-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-ro-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robux-cheat-download_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-tradelands-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-robux-sin-verificacion_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-daily-free-spin-and-coin-link-haktuts_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
font_00_sfnt_off000032df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32DF 22572 bytes
SHA-256: 8ddcd2037b0a1e2a205f04b97ef616999e48ed4aaa552ab98a272974b00fe120
font_01_sfnt_off00006564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 18388 bytes
SHA-256: f7343f89130bbe7749ba861c18716880cd21441eb855f17b99e2147c09a8a62a

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