Malicious PDF — malware analysis report

Static analysis result for SHA-256 d376edeb96445f22…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 06:18:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 28a99b7c08a5868a228ddaa57b531fc6 SHA-1: 40d923867413ffd32a6c5ec2c09b36f47e5cffb5 SHA-256: d376edeb96445f22daa98d3b5568a6d8cd47db849fdab3c2d588e147fcfaa12c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm, pointing to websites that appear to offer free game-related items. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the heuristic for a link farm suggest the document is designed to redirect users to potentially malicious sites, likely for malware distribution or phishing. No scripts were extracted, but the structure and heuristics indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/479516143/free-domain-for-minecraft-server-game-hack PDF link annotation
    • https://cintasoeste.com.ar/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/robux-converter_GM431946152.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://cintasoeste.com.ar/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://freegiftcodes.euIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004805.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4805 25252 bytes
SHA-256: d9a2910b9ebf24c78000785ab43644323db20d1052838c98fcf0bfa4bc612bdd
font_01_sfnt_off00008164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8164 2920 bytes
SHA-256: ada9123130b44c2e3ec1e318ac0de3fc1240d1bf6c68092e8e5867f836aa052d
font_02_sfnt_off00008b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B81 18252 bytes
SHA-256: 7978d84717849f7fe583135464e7fa2f965b05bc02f62d7a17151b102e6c088e

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