Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae9f7ffe1329e7…

MALICIOUS

PDF

33.8 KB Created: 2020-09-01 00:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f043ccd2dcb1cfe1ac363d5f501a85a8 SHA-1: 776bc81973f9ebcf93604bd6d6ebc0df51f431ef SHA-256: 98ae9f7ffe1329e707e0f9001f6d9ce3dd9ecb1cd7607aa322a6d5cd686e83fb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL and text related to graphing functions, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a larger infrastructure designed to distribute links, likely for SEO poisoning or traffic generation to malicious sites.

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=graphing+exponential+functions+worksheet%2523+2
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/64253673531.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/mekokujerabimug.pdf
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/ireport_for_ubuntu.pdf
    • https://static.usrfiles.com/ugd/ace02d_6f15b57c72c3459eb180697de1da37d1.pdf
    • https://static.usrfiles.com/ugd/0286dd_819d444d8a434be49a3d7cb6c06bd111.pdf
    • https://static.usrfiles.com/ugd/4d6844_5a68ec5253cf4a569df95b16868da07b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c08e2b32d974bb4bce95ae801a6f177.pdf
    • https://static.usrfiles.com/ugd/9a242c_a96f34fe4eeb4b14bc274b776a0dc478.pdf
    • https://static.usrfiles.com/ugd/451461_6132f5983dbe4811a446c3aa7b8503e3.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_60f9ef15da844bfab0eb5bc879147803.pdf
    • https://static.usrfiles.com/ugd/7f46b5_3eb7323ce7184974afae9628532343ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e06fc5fe7142e8833420b4b276a4ec.pdf
    • https://static.usrfiles.com/ugd/516793_f5c7724d1db54296b372885886ae6692.pdf
    • https://static.usrfiles.com/ugd/26481d_105b17a2310b47649ae93dbbff5d656a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1a0654b70ed4c788273c6c4335679f8.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_off000047de.bin
cd9f979636d1a2d4f6d46459b4e51a2c5733b31210e0e5b7f894595f2e3a8279
pdf-font-stream PDF embedded font (sfnt) at offset 0x47DE 5532 bytes
font_01_sfnt_off00005ac8.bin
a42a34257c34a2cc93a5560a3f109f5a9d53d8052ebf09176c7a21de3b053e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC8 9236 bytes