Malicious PDF — malware analysis report

Static analysis result for SHA-256 1427cef4958a0a7e…

MALICIOUS

PDF

33.7 KB Created: 2020-08-18 14:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2b7394622631903290f14905609e12 SHA-1: 67a4317d7390c8c0fd73f2aac56289cf62866cc1 SHA-256: 1427cef4958a0a7e3c671e6d3aaa707337578790771db44c8fd3d204910dc4e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links redirects to `https://ttraff.com/pify?keyword=c+vs+k+worksheets`, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious redirector and the sheer volume of links are strong indicators of a malicious intent, likely to drive traffic to malicious sites or distribute further malware.

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=c+vs+k+worksheets
    • http://files.structuralbodyworkhawaii.com/uploads/1/3/1/8/131871648/7759232.pdf
    • http://pugud.mrgauronroom.com/uploads/1/3/1/0/131070054/bfb1d4b7101.pdf
    • http://files.clairehedden.com/uploads/1/3/0/9/130969800/9225637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/kakerilavazenigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/wuxal.pdf
    • https://cdn.shopify.com/s/files/1/0432/9101/7374/files/darufe.pdf
    • https://cdn.shopify.com/s/files/1/0436/6240/9881/files/deribigiwimaxaxenupudid.pdf
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/40418111520.pdf
    • https://cdn.shopify.com/s/files/1/0439/0689/1931/files/exercicios_arcadismo_com_gabarito.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0580/files/lusekovo.pdf
    • https://cdn.shopify.com/s/files/1/0441/4049/5000/files/rig_veda_sandhyavandanam_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/topunara.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/55735001448.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/script_for_radio_interview_format.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_off0000489a.bin
fb6f69407fe581ed4b39d1ca82a03cec3a556df5fe467499c8b6995ed7282792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x489A 4652 bytes
font_01_sfnt_off0000587d.bin
01d2e3ecad3c114298e16bce0a7851fb24c03392458e55b7ff78089f4e5c9094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x587D 9876 bytes

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