Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddcf618b73356dd…

MALICIOUS

PDF

42.3 KB Created: 2020-09-08 22:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009b17ca1bd578725c965fde98374226 SHA-1: 69141723d77ab0af5fa3d2c74a6b421c5d89d8ab SHA-256: bddcf618b73356dd629dd8750c1c91a967fb75d9adb2726d8e348030e4ff63e1
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'line graph worksheets grade 4 pdf' and the malicious URL. This suggests a phishing or scam attempt using a lure of educational content to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.club/wix?keyword=line+graph+worksheets+grade+4+pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/executive_administrative_assistant_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/wokovejipujosivapen.pdf
    • https://cdn.shopify.com/s/files/1/0463/5200/7325/files/gokek.pdf
    • https://static.usrfiles.com/ugd/b8c837_79eba934a7234347be9d08136de9d753.pdf
    • https://static.usrfiles.com/ugd/361f4b_7505128501834a079ba60ebcdd3829eb.pdf
    • https://static.usrfiles.com/ugd/f80014_e5f65dabddad4939b91f031cb3819bff.pdf
    • https://static.usrfiles.com/ugd/55f640_9be2b4fb45b34737b838ba35d65372b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca40a1fc49a2463e946423faa3ff8284.pdf
    • https://static.usrfiles.com/ugd/e5a943_454b7934a34d4c2f892d89bc1d9e34eb.pdf
    • https://static.usrfiles.com/ugd/e6092c_4934b03ee000410c9ed0d2e4e4b23589.pdf
    • https://static.usrfiles.com/ugd/6116da_34d609b5e74a423f8c09c5526bc57486.pdf
    • https://static.usrfiles.com/ugd/b8c837_1426225cefd9417493bf0331e6b88b03.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/exercises_present_simple_1_eso.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0629/files/13417809397.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006607.bin
b8630c27b6de08d4785e026c0e9cf8f66f6ad6263752a7de04da6e7ed9527f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6607 5456 bytes
font_01_sfnt_off000078b2.bin
0c572d14b707d331a5a8423be0a041956c4d38b770d84a42b6414701e0436dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B2 10688 bytes

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