Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafbe3b2352c1d29…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 03:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00f6607b79856801866097b8d5757755 SHA-1: c08ff817d62d1d710df2f0d17c319f241869cbf4 SHA-256: eafbe3b2352c1d29167c2e1196fea7016c7932a8110069bfd3457ccfc49b4975
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.ru/wix?keyword=armas+de+mudan%25C3%25A7a+warframe'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one pointing to 'https://static.usrfiles.com/ugd/eed56f_500bfab0b237410cb8f7f8b0a208d3ca.pdf'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure, but the presence of malicious links is the primary indicator of compromise.

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.ru/wix?keyword=armas+de+mudan%25C3%25A7a+warframe
    • https://static.usrfiles.com/ugd/eed56f_500bfab0b237410cb8f7f8b0a208d3ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_f139695ee2484889a870e9f9d6725a17.pdf
    • https://static.usrfiles.com/ugd/b52961_ec7ee8d76e6c439f8e2e713498b4182f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6b64974eaf54542941a3648d5c078bc.pdf
    • https://static.usrfiles.com/ugd/38bf1f_6d663283133f4a98ae0c8a265d974ac9.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/dizumigepuwafiwosunejif.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/rudram_chamakam_kannada_download.pdf
    • https://cdn.shopify.com/s/files/1/0465/2941/3278/files/57534975381.pdf
    • https://static.usrfiles.com/ugd/b9801a_0697ed2a0b1b45158f512652b23b7c6d.pdf
    • https://static.usrfiles.com/ugd/6df952_8f358418c7da495eb2e8d57db497e656.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/73192596122.pdf
    • https://cdn.shopify.com/s/files/1/0431/9841/5010/files/50488297170.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/75487562642.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8850/files/zekanepakikasodu.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_off00006dd5.bin
2ec1ff8e9d77fe6628113c672d7f4e719594452b9741fee03b27b228737312f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 5284 bytes
font_01_sfnt_off00007fba.bin
53bae8d049a0667b3785964d0227a4332b34bbe47d78732833ab5e7302fb7cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBA 12380 bytes

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