Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c183de44c6b9ac6…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 03:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d561ee432704638decc3b1bbce7f2bb8 SHA-1: 10e2eb9ebe66f0e8845aa66f03afb7308c8cbc14 SHA-256: 8c183de44c6b9ac6c3e889b3c444dbcb92eead4a02253de403953e855f81c1aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to a homestead exemption form and a malicious URL. The primary malicious URL, https://ttraff.cc/pify?keyword=tarrant+county+appraisal+district+homestead+exemption+form, is a clear indicator of a phishing or redirection attempt.

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/pify?keyword=tarrant+county+appraisal+district+homestead+exemption+form
    • http://files.raw-angling.co.uk/uploads/1/3/0/9/130969428/1c90511c769b6ab.pdf
    • http://dizavuzex.lcmbands.com/uploads/1/3/2/8/132814342/xinaw.pdf
    • http://gikeloj.upotteryvillagehall.org.uk/uploads/1/3/1/6/131607163/0db49cf886.pdf
    • http://files.kevinpascalethomas.com/uploads/1/3/0/7/130738789/b17dc7ffc2adcae.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/cra_representative_authorized_form_business.pdf
    • https://cdn.shopify.com/s/files/1/0447/1092/0345/files/champion_of_atrocity_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/soboj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6187/0741/files/xapire.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/xopipemumivoganukolojuti.pdf
    • https://cdn.shopify.com/s/files/1/0433/5435/7915/files/7th_bipartite_settlement_of_bank_employees.pdf
    • https://cdn.shopify.com/s/files/1/0454/7356/2790/files/cse_global_limited_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/9870/1977/files/dososide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/58900628480.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/xadefogenudepizoxemaruvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/sample_letters_to_judge.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1294/files/barium_sulphate_msds.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/gumevigemekavolakenagum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/atomic_structure_quiz.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_off00005b0a.bin
edbb816b25ecfc71444e87a16334e5437543373e5d3ee890ed802c9943b3ff3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0A 5516 bytes
font_01_sfnt_off00006da6.bin
bf7ce42f4c9ffdeb059c385c17c584810e161032b8a3a7cf1a50af7b264b9400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 12372 bytes

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