Malicious PDF — malware analysis report

Static analysis result for SHA-256 195a81cd306d85c6…

MALICIOUS

PDF

52.6 KB Created: 2020-08-30 12:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a13d4074b5238f3d275247831f7c20 SHA-1: eb7947b1f689193f80901b6803635c966e245506 SHA-256: 195a81cd306d85c6f9cec94a3610b776c3203d12d280a6256a10b307cfebc6cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=k%25C3%25BC%25C3%25A7%25C3%25BCk+a%25C4%259Fa+n%25C4%25B1n+%25C5%259Fark%25C4%25B1lar%25C4%25B1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/vewob.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/cakephp_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/kujemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/upkar_reasoning_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/40488019806.pdf
    • https://static.usrfiles.com/ugd/b42fd6_97126eb512724fa498a6f937b0eff376.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_7252c67fe41d48c786a0a4a065b1d5f1.pdf
    • https://static.usrfiles.com/ugd/5ed537_3289937a642044d6a03405ad8523ebdc.pdf
    • https://static.usrfiles.com/ugd/6908d7_5ca620bff39d4e13a6b9df19ef5c0bdd.pdf
    • https://static.usrfiles.com/ugd/3b47cb_206f7b2c07ba44ab8f5ad4e1494691e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_296a7194bc64428487bb5348f098e60a.pdf
    • https://static.usrfiles.com/ugd/cc03df_93193398b22b420babbad1c19ea9ffc1.pdf
    • https://static.usrfiles.com/ugd/ad2ade_a94eb9b1f2a14e9f961682507b23f4c4.pdf
    • https://static.usrfiles.com/ugd/a48928_7cb4936a0d6f49e3a67d0744ba203c27.pdf
    • https://static.usrfiles.com/ugd/834936_b82abd8d418a4d168126edecd8c2e4d3.pdf
    • https://static.usrfiles.com/ugd/99a8f2_fe733c59c8f5462eb2458a7d8bbcb2e4.pdf
    • https://static.usrfiles.com/ugd/e4ff69_129f9c885e92459bbfd1a27f9b8b1909.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bfe.bin
8a130a55c366f3a1a1774d3262fc3139cc4f046a4c29c370e7d40b82df013b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFE 5344 bytes
font_01_sfnt_off00009ddf.bin
7b3421d87274217c92c84731a06c903c8726747374bbcf1792c54ec2c88b7919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDF 12536 bytes

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