Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a42fb0d06a1719…

MALICIOUS

PDF

44.0 KB Created: 2020-09-05 13:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 45f0c45a325cb2c52cde313fa90a3cc8 SHA-1: 3ab7c2f12943a1bbc114f7666902ccacb4b16028 SHA-256: f8a42fb0d06a1719386589bdccfacd2006f584b0675cfb95e0f356b17afcb200
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=uc+browser++apk+app', is designed as a social engineering lure to trick users into installing malicious software or visiting a phishing site. The heuristic 'SE_BROWSER_INSTALL_LURE' further supports this, indicating the document's intent to deceive users into installing something they believe is legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=uc+browser++apk+app In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/45240397964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/wuxugexawamemiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6782/4533/files/32691803972.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a891c0_be1d3c786d0449bb930b9021e80934c5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ee299560ee4442fbb99473f9bbd577f1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eaf48f_b91f60f06cd743d3a2a2d2ade17d7bd6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/71fd01_f40dd2dd39ad4cd68b4804add26d5737.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/26481d_75c9b18d08c141048ef2ca93c11605c4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c068f8_578fdfb1c1e14254b19119095ecf5f52.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 5184 bytes
SHA-256: cf4d980197875cac08866c1a8329bba7223229c8f58e82e48e15d5edf3b800f7
font_01_sfnt_off00006bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF6 10060 bytes
SHA-256: 9082c5a741826ecdf3a3798537baf5593e810d44ebcb04c5c5fe7bffe7639aaf
font_02_sfnt_off00008ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA9 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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