Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fed0eef958b251f…

MALICIOUS

PDF

42.4 KB Created: 2020-08-23 12:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eabcd5b2180218aa1ed4bdbb375f102 SHA-1: d531fd96ec8c18f3fde3e3f1d60606eded07b7b9 SHA-256: 0fed0eef958b251f9b5cc8545fc3ad779dc3ddd043cfb753cf166142f027953f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, disguised as a Google Sheets app dropdown list, redirects to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests an attempt to drive traffic to potentially harmful sites.

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=google+sheets+app+drop+down+list
    • http://files.tsgmidwest.org/uploads/1/3/0/8/130813447/6901693.pdf
    • http://riniz.heidihindachadwick.com/uploads/1/3/0/7/130775934/tuvoxivinamu_wijemes.pdf
    • http://files.westfordregency.com/uploads/1/3/1/3/131398010/3228959.pdf
    • http://files.bridgestoserbia.com/uploads/1/3/1/4/131452991/7654863.pdf
    • http://files.krisyforce.com/uploads/1/3/1/4/131482946/3172449.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/wolovabim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/97497280624.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/pastest_mrcp_part_2_free_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/64817213815.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/65951147210.pdf
    • https://cdn.shopify.com/s/files/1/0448/2190/5570/files/funciones_de_base_de_datos_en_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/boyfriend_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/que_es_la_anemia_y_tipos_de_anemia.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/los_logos.pdf
    • https://cdn.shopify.com/s/files/1/0439/3087/8120/files/calibration_technician_resume.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/71189016186.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/juvofezazival.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_off000067fc.bin
86497594849dcc55297349f66052fb33f9a707a0ca363bc771c28a2269875211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 5344 bytes
font_01_sfnt_off00007a37.bin
48474327f49780c1ce8fd620dec92bba9798a205172890a02a1962b381589176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A37 9912 bytes

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