Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cb1fefe1f26418…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 02:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85e6270dd45fb03860cc46d0db8762c0 SHA-1: 8f82611038491091d82c99ebc0c2c6b6acc157a5 SHA-256: 67cb1fefe1f26418d0a25ca53af6f6976a445858159828b59af3565c4089dcad
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, including one that redirects to known malicious infrastructure. The document body is obfuscated but contains a URL that is also present in the heuristics, indicating a likely attempt to lure users to malicious sites. The presence of multiple PDF links suggests a link farm or redirection strategy. No scripts were extracted from this sample.

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/pify?keyword=queensland+cursive+writing+template
    • http://files.glovarnet.shop/uploads/1/3/2/7/132740930/gajipefujazozazobepu.pdf
    • http://files.lacedwingdesigns.com/uploads/1/3/1/3/131384436/fumozada-gejitumisevilal.pdf
    • http://duliguz.traversehotham.com.au/uploads/1/3/2/6/132695471/202272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/4410/8453/files/branches_of_metaphysics_in_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/ios_for_macbook_pro_2010.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mefawubizujoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/dawogavagidax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/tiriladibuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/rujugobasezixizuxon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/50803374968.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/59044525596.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/ring_isomorphism_theorems_proof.pdf
    • https://cdn.shopify.com/s/files/1/0440/5487/2214/files/77298646340.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/bkdrluhar_daily_murli.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/software_project_cost_estimation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9363/files/mixelubasuda.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_off00005d1e.bin
5a28224af8f072ea79f18c404680c15a0ab96bcc3b5db32fc9de3ad7c301a6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1E 5376 bytes
font_01_sfnt_off00006f5f.bin
c4bc9933c7a182a947b74ac49ba9db0aa3e73fdda192905e2a693ae7d2f72f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5F 10456 bytes
font_02_sfnt_off00009339.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9339 4324 bytes

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