Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35be5cadf5b1f07…

MALICIOUS

PDF

58.3 KB Created: 2020-09-16 23:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea997b29e20cec9cb8df2c7af644aff3 SHA-1: d79eb4973984a30460486a6d93f341699fedb2d9 SHA-256: b35be5cadf5b1f070815ba56558b0e15357d18ad5a5abdbbf45cefad5f442e71
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The PDF also contains a large number of embedded links, many of which point to benign files, suggesting a link farm or SEO poisoning attempt to mask the malicious URL.

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.link/wix?keyword=sample+letter+of+invitation+for+guest+speaker+in+church
    • https://11b6b51b-a0f0-4e3c-879e-75874ac64c93.filesusr.com/ugd/370ea2_338090f806d1423a8648a030bfdf88ab.pdf?index=true
    • https://248f49dd-8b5c-410d-b75c-35ecdf3eab7b.filesusr.com/ugd/38eac1_57152f4e53184a07809fde0b93ca2b81.pdf?index=true
    • https://af5cc682-896a-4004-8da5-601b53c080ae.filesusr.com/ugd/694d5d_d8e340ea1ae14b2f82266b8831129603.pdf?index=true
    • https://79e81a30-06fb-4a34-a55b-f4fbc214319f.filesusr.com/ugd/031dda_81137be4875b4ae89a0be9aebe2826f5.pdf?index=true
    • https://75072703-c210-4ff4-8ba1-663774642650.filesusr.com/ugd/b5472a_17d60ed5e7bc4df78151e4ccb3fee622.pdf?index=true
    • https://2cc1543e-dc6f-418f-8c27-8ab3c8b12660.filesusr.com/ugd/d4579c_1ca731ef829b44c28932042692683e2a.pdf?index=true
    • https://2cf8f385-ce8f-4f2f-9110-face19a86131.filesusr.com/ugd/e0d0cf_65548305e0024d51b66d94d7023d4d6f.pdf?index=true
    • https://f8b14319-aedd-4f26-8ccc-e628ecb5a7ed.filesusr.com/ugd/74e905_860f6702d69b4ff586ec8fa58cb665c2.pdf?index=true
    • https://5400c363-f623-45ef-b8b9-23d5bf1b19a5.filesusr.com/ugd/b3318b_f7983a729e654f97b335ecdef0e5b709.pdf?index=true
    • https://f310f583-221e-45bb-9cc4-89407a5851c4.filesusr.com/ugd/d2751c_9f83a51058ed41caa21f2e6e46e1d4ff.pdf?index=true
    • https://dcf893c6-6fe3-48e5-a92d-52b607d688be.filesusr.com/ugd/66f3f9_c84c805348ef44f9a199446444bbcd73.pdf?index=true
    • https://fa898d32-6c8e-4c58-8423-a6cb063b16b1.filesusr.com/ugd/ccf397_5fe78241d0314a3ebe3a47a5b23dfafd.pdf?index=true
    • https://c589cfbf-db74-4efd-8c2f-d8df81a5dff7.filesusr.com/ugd/bb05c1_e91dc1d014574138b93a6ae1ec377a59.pdf?index=true
    • https://5089bdbb-27d3-4e37-9e12-85e350aec392.filesusr.com/ugd/cf9ff1_2306eaf6c7424d0d86e6958e68d2adb2.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009586.bin
bb67e4e2dc8e24706c5895e63814d2fe174f0d7fb1e9087ec24452a14c508870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9586 5536 bytes
font_01_sfnt_off0000a834.bin
06cc95028c36d90e0e22039567784e527aa7368c485199e37dc6f7a0b6b4aece		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA834 10948 bytes
font_02_sfnt_off0000cd9e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 4324 bytes

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