Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c1fb6baeec3d77…

MALICIOUS

PDF

45.0 KB Created: 2020-08-25 07:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1e88e8d5aa8a95a3134ff50833b8bbf SHA-1: 68193c43b55cd9d9bb3f06b301beb44a2a026bd1 SHA-256: 07c1fb6baeec3d77319bd2d3624be7f7ee9a3e6453e8338c5169ffd4375e06d0
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to distribute malicious content or engage in phishing.

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.com/pify?keyword=trigonometric+function+graphs+worksheet
    • http://rojaran.lewisgabbmusic.com/uploads/1/3/2/6/132681670/1143088.pdf
    • http://jewaraso.d-aleksandar.com/uploads/1/3/1/8/131856072/7fe695da2346.pdf
    • http://files.jennifranzlowcarbliving.com/uploads/1/3/0/7/130776266/2671783.pdf
    • http://files.newheartandmind.com/uploads/1/3/1/4/131437765/xaterirenixerir_nozadodafiwe_bafogemivefo.pdf
    • http://files.duarteband.com/uploads/1/3/1/8/131858540/vigasedibawugod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7507/5225/files/wukufe.pdf
    • https://cdn.shopify.com/s/files/1/0440/1142/1854/files/adobe_after_effects_tutorial_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/6365/4040/files/49381914901.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/91818978369.pdf
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/84707442947.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/jopelijadenukijiregubofit.pdf
    • https://cdn.shopify.com/s/files/1/0438/1825/4498/files/addition_and_subtraction_worksheets_for_first_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/57754230805.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/lozularisejatuzokesawano.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_off000071b0.bin
15f8e83e8fe53ce8f9d0e5c84af2f8be0c9bd472fc6c2bb118e0379078543b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 5500 bytes
font_01_sfnt_off00008454.bin
42a029a25c371521aadba48f0aac6599a392b809c05d3a60801f7a2e8f21feb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8454 10292 bytes

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