Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e84bc2cb8aa694…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 15:02:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ddc24c88f339d77d4511bf4a7dbf0ede SHA-1: 07479cb67085d3033e3e523b7a88388d0318f741 SHA-256: 88e84bc2cb8aa6945cfc40f7d94795d7369c22fbc7bf48ec1e12bc8262cf0638
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious lure, employing a link farm strategy to direct users to external sites promising game cheats and currency. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, including one to 'netcdn.tw', suggests a phishing or scamming attempt. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

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.tw/app/431946152/roblox-robux-codes-2021-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/fly-hack-for-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-create-vip-server-roblox-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-accounts-2021-october_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-games-that-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-police-uniform_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-account-biz_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-roblox-carlos-admin-house_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/slurp-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3025 22140 bytes
SHA-256: 28d8f3ee483688ceee807f241f00af4a98b83767003896b766d151fab0f83e4a
font_01_sfnt_off00006130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6130 19204 bytes
SHA-256: bc750578e017cfee0e53610975505914a1d043d3eab3943ee4073a15e39fd014

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