Malicious PDF — malware analysis report

Static analysis result for SHA-256 821edb616061cbbe…

MALICIOUS

PDF

34.3 KB Created: 2021-06-27 03:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e0627721bfc79dd6cee136e4cdc2cb59 SHA-1: 0ed51ad6a74096a4d83adb363aa1755308d314ea SHA-256: 821edb616061cbbef255193a7568286b8805ff9eae5ec380f3eb3f80411981af
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external resources, many of which are SEO-optimized PDFs promising free in-game items or account hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic suggests a lure to download further content. The primary attack pattern involves tricking users into clicking these links, likely leading to malware downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/como-robar-cualquier-cuenta-de-roblox-hack-game-hack PDF link annotation
    • https://beauty911.tw/upload/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/robux-only_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-100-working-no-verification_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-to-make-shirts-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/tiny-tanks-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-im-gay-roblox-shirt_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-roblox-games-yow-can-make_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://beauty911.tw/upload/files/get-free-spins-coin-master-2021_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_off00002e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E09 22324 bytes
SHA-256: 32b65b88284b8ab36724d7ad176d284d9f6bc73c59304cb3df8153eb78fa7426
font_01_sfnt_off00005f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 19620 bytes
SHA-256: 9e31fa9c0a30144f28409f379d003737ced1f04dc85d47cc5bf20814ee163945

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