Malicious PDF — malware analysis report

Static analysis result for SHA-256 850b8c1e59d2e54d…

MALICIOUS

PDF

33.8 KB Created: 2021-06-26 22:26:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4b9ddfc54da640eae9b50f6130222e2d SHA-1: c3265199c386152361e35206df304f9c449c91aa SHA-256: 850b8c1e59d2e54d7c7cc73cf2e7b99270a263745d5818eb7a5f52fd1cc45f36
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on the same domain, suggesting a link farm designed to attract users searching for game cheats and virtual currency. The presence of a direct download URL and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF with high confidence.

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/www.hacks-for-roblox-game-hack PDF link annotation
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/roblox-free-blue-hair_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-no-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-and-coins-on-coin-master_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_off00002e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E62 21664 bytes
SHA-256: 47521e360e9d6ec8ff514459c528ec467bac6947c05ed812e11e50c9c75a5f06
font_01_sfnt_off00005e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0F 19412 bytes
SHA-256: 2adce43a7820feb9a26da2c355c9712180a4b07921d5446790d72613e10a0435