Malicious PDF — malware analysis report

Static analysis result for SHA-256 713cf1249ba3fb79…

MALICIOUS

PDF

34.2 KB Created: 2020-08-21 02:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3748b764a5cfa3cc37b8e142be4a10f SHA-1: cc462d17bae5f6d5d42e8926db6f6a499056f27a SHA-256: 713cf1249ba3fb7938bf6cb58e753cf646ce05de8ed44d2a5afa86a96e347b49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign Shopify URLs, but one points to potentially malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and a benign-looking URL, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic strongly indicate 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=isolated+system+muse+sheet+music
    • http://gapugos.billshobbiesmodelshop.com/uploads/1/3/2/3/132303382/pipen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/quality_assurance_technician_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/esv_archaeology_study_bible.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/22564662482.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/jujamolonutepekazulewuzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/78452561011.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/ccna_exam_dumps_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/equivalent_fractions_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/check_domain_name_registration_information.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/formation_potier_ceramiste_toulouse.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000488d.bin
3d5ed350ab3d30dad9c2aa432a89f4b69510fe018a4f2aefb6d902e5e08b4977
pdf-font-stream PDF embedded font (sfnt) at offset 0x488D 5124 bytes
font_01_sfnt_off000059da.bin
f6b3708cfc477278667f3856fc7bd852b308e95b93732a8871b8fd2129f57085
pdf-font-stream PDF embedded font (sfnt) at offset 0x59DA 10128 bytes