Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cb2ecd8d1ecbae…

MALICIOUS

PDF

45.5 KB Created: 2020-07-22 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e3b91e717ade8f7d29490252231131b SHA-1: 91679b2e9581db9c0f599d1e9d126b3d2bc41d5e SHA-256: 18cb2ecd8d1ecbaecb12d9d27421a6af515cc7622bc7d16ad35806f1b9c72195
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a common tactic for SEO link farming and potentially distributing malicious content. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead the user to a harmful site. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users, likely for phishing or malware distribution.

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.ru/wb?keyword=iso%2027001%20statement%20of%20applicability%20pdf
    • http://files.aplmf.net/uploads/1/3/2/6/132682829/c0443958.pdf
    • http://files.asdontheroad2019.org/uploads/1/3/2/7/132712661/lejozugezite.pdf
    • http://files.facchollywood.org/uploads/1/3/2/6/132682063/zolutigiw_sowosuvagu.pdf
    • http://files.artofextensions.com/uploads/1/3/1/0/131069897/rirunevudejoga-kazazor-zorupatafawu-nisigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/48864168600.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/75125504059.pdf
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/daborugilowif.pdf
    • https://bubusajofugi.files.wordpress.com/2020/07/viwozo.pdf
    • https://zawamibidixa.files.wordpress.com/2020/07/14833513228.pdf
    • https://xoxefudisose.files.wordpress.com/2020/07/pawidefibegikadixakaxop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4491/files/17566987411.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/vefusaxisoxubediju.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/91243413804.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/1736028684.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/25746328424.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/52775133877.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/91000749400.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0561/files/51090148470.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/puzolibuxezosaxisikum.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_off00007283.bin
bdc7291d2dcecfc32bfb6b418bd36dcba45835eecf9f9fcd4ac67386b3031cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7283 5580 bytes
font_01_sfnt_off0000856e.bin
44e8d9ebfe1357cb630ebec27427475b88ec4532b07a2b1fbb775695670fa2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 10456 bytes

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