Malicious PDF — malware analysis report

Static analysis result for SHA-256 641f435eee3e0fc9…

MALICIOUS

PDF

46.3 KB Created: 2020-08-30 22:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae039e0fb953d453ef186a0b79b010dc SHA-1: 0186b04db4227c20f92f49854121f6a24a6aad5d SHA-256: 641f435eee3e0fc9e150451d0d42ec69a0ae607023f96a99861e48c78c3d3597
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.cc/wix?keyword=balfour+v+balfour+pdf, which likely serves as a lure for phishing or malware delivery. The ML classifier also strongly flagged this document as malicious.

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/wix?keyword=balfour+v+balfour+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/sabevi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/dalevusasavamozizatoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/nejelujufinukedikoledex.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/85454796083.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e0065230e734c89bf394a82127e6c96.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f625cbcf4794ec5883a050d4165a7bc.pdf
    • https://static.usrfiles.com/ugd/63d3ad_ab413d9a17c3440d8b0bd61ada65659d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6ded65ed64640508ddf66f5508659ab.pdf
    • https://static.usrfiles.com/ugd/735189_8d44be5efa484d3ab90ad8dfdd64d400.pdf
    • https://static.usrfiles.com/ugd/2c608b_c96b8fbaea47452a823c1eec3f6e0e2d.pdf
    • https://static.usrfiles.com/ugd/ae15ca_db773556f86c4f939023a1e8d812924e.pdf
    • https://static.usrfiles.com/ugd/0c268c_dcf12171730d419f98f56ed6e9a724b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ba279458667455ebbb32874e2a526c4.pdf
    • https://static.usrfiles.com/ugd/36f25b_a54347c75fc94b7db5c5d8ee3657fdfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad839648952a4f50aded2fd2e65d4f8a.pdf
    • https://static.usrfiles.com/ugd/6d59ab_41a87b3d3df24507a2acc7b6c0ba8deb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca5.bin
1b07e9bd5f1a47c5fcd05f085c5bed022d405134cbf00029891749448b0dd15d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 4636 bytes
font_01_sfnt_off00007c6c.bin
253073866fa27a87d68145e60f97d515eef1de2715ceb91b6b62c5748ff98254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6C 9948 bytes
font_02_sfnt_off00009e78.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E78 4324 bytes

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