Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff751f613c7162a…

MALICIOUS

PDF

33.9 KB Created: 2020-09-18 16:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a4b45010baf682c6859adcb528d310 SHA-1: 8197316c349f043efc182174f764d023b561bd28 SHA-256: 1ff751f613c7162a507c17cb2589172e0da8263f905ff71811b7ca9ad3e17fa5
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes the text 'Dividing fractions with area models worksheets' and a URL that matches the malicious redirector. This suggests a social engineering attempt to drive traffic to malicious infrastructure, likely for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of direct payload execution.

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.link/wix?keyword=dividing+fractions+with+area+models+worksheets
    • http://vibol.westernwilcodemsclub.com/uploads/1/3/1/4/131452903/lelisu.pdf
    • http://files.devizestaxis.co.uk/uploads/1/3/0/7/130776041/wakuvul_xuwip_xokom_tekis.pdf
    • https://f45db6aa-57d4-4b41-943a-5be86c72a8b0.filesusr.com/ugd/c12414_32946c119b6b4c0aa3e35433388bb09a.pdf?index=true
    • https://958a31db-7bd1-4ae2-afb5-50c2c7945ba3.filesusr.com/ugd/7a7fb1_1c66b8453760491fb904b5c74de60bc4.pdf?index=true
    • https://c70981a9-6c39-4745-8915-77f3f8e3a747.filesusr.com/ugd/361f4b_589f621bc62b4143abcaf64fa1745786.pdf?index=true
    • https://db925a8c-5524-42c1-9b36-5639ee789923.filesusr.com/ugd/b4a829_8c04f5b6bc454706954019ad0d96c303.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/microsoft_network_adapter_multiplexor_protocol_driver.pdf
    • https://cdn.shopify.com/s/files/1/0485/3894/3643/files/sat_math_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2856/files/bosizikizitinigapan.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/79376208108.pdf
    • https://cdn.shopify.com/s/files/1/0437/5429/1354/files/ejercicios_asientos_contables.pdf
    • https://cdn.shopify.com/s/files/1/0435/1531/4330/files/hotel_management_system_project_repo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/kaxakefi.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_off00004708.bin
7d9fe92bddcce7f992cc3a857bbc6ab53fb39f3dd3c5a5928d246118bfd4e65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4708 5648 bytes
font_01_sfnt_off00005a33.bin
c4c6253a44e6c6a4109e3aa08a9ffbc29f81daf730dba1a40c011e1c78869efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A33 9568 bytes

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