Malicious PDF — malware analysis report

Static analysis result for SHA-256 02146b7f4ff6434b…

MALICIOUS

PDF

34.9 KB Created: 2021-06-21 10:07:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f9e267c26c41b4fa86bbfce93d9b787a SHA-1: f60682efe5a459dc8ad8524c49646b8c1afcbadf SHA-256: 02146b7f4ff6434b97bc347fbf30420b201a08741def70093e0ec388a8cc06c4
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/how-to-change-your-roblox-password-when-you-are-hacked-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/life-in-paradise-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-menu_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/2-accounts-on-one-pc-for-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/como-hackear-ordenador-en-roblox-cuentas_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/tiktok-free-auto-hearts_GM835599320.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-free-gift-card-org-hack_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_off00002f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0F 22536 bytes
SHA-256: 95cd2b800a9352f0dd446ac894e0f2f0485e3e83fefbf1c28bd65b56b681b8f5
font_01_sfnt_off00006136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 19812 bytes
SHA-256: 6ed2ba7d7af1d7db04cece19c448593413646b57ad2af9aa2a425348154e6a6f

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