Malicious PDF — malware analysis report

Static analysis result for SHA-256 15493f5f0fa776f4…

MALICIOUS

PDF

44.4 KB Created: 2020-11-06 21:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b15ea6d17fb1d989a45c364d26eeefb SHA-1: 52ef15220ced7fc8f569685da16c786fed17a30f SHA-256: 15493f5f0fa776f4b63c07612c831346a89f1ad182950dc14a8942c8178d1094
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body and heuristics suggest a lure related to remote support tools, which is high-risk in unsolicited documents. The presence of a large number of external PDF links indicates a link farm, likely used to distribute malicious content or for SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://traffmen.ru/123?keyword=computer+cafe+software
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/tukonu_xadateriropisa_vizumi_sabasepurolava.pdf
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/6323409.pdf
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/dudabaludapabamo.pdf
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/fotosat.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/gerezu-nevagemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dcaa6b89-35ec-44c5-8b5d-20b10dd28a90/vijapoku.pdf
    • https://s3.amazonaws.com/nigimul/brief_publicitario_de_adidas.pdf
    • https://uploads.strikinglycdn.com/files/c82a6951-4cdc-4e65-a80e-9aa98591ffc8/sajezubufuxisasogipisi.pdf
    • https://uploads.strikinglycdn.com/files/bbefa34e-0a8a-4c3f-974e-1dc4cb8ca7d4/depixasejataj.pdf
    • https://xuwogupiz.files.wordpress.com/2020/11/27298665485.pdf
    • https://uploads.strikinglycdn.com/files/1c1bef66-0bda-45da-a8d3-4b8534056dff/xujopagasawosoxibadofim.pdf
    • https://uploads.strikinglycdn.com/files/5bfbb291-bee5-45b7-ae55-3298fe1d444a/66748114074.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_off00007032.bin
306e2d191d2e8898fac2b0c60076be4e52a17c684716efd3d16c1709038f01c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7032 5124 bytes
font_01_sfnt_off00008196.bin
dafc5b0a2917f32fe12e5e414ba2b4aa105e990546f67b9fd43189aff1fb26f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8196 10396 bytes

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