Malicious PDF — malware analysis report

Static analysis result for SHA-256 6833205144b1131b…

MALICIOUS

PDF

39.6 KB Created: 2020-07-10 01:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98dccaea0e3745c56569f6dbd2ee94b0 SHA-1: 8900f32d79a30e6b047e31dfb11b91db1b4db98c SHA-256: 6833205144b1131b01d314c71090eda7c06f2b3e13e99d09046b5e0e4399f75c
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, forming a link farm, and a prominent link to a known malicious redirector. The document body, while partially obfuscated, suggests an educational context ('Factor linear expressions with rational coefficients worksheet') to disguise the malicious intent. The primary goal appears to be directing users to malicious infrastructure through these links.

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/wb?keyword=factor%20linear%20expressions%20with%20rational%20coefficients%20worksheet
    • http://files.mybestdoodle.com/uploads/1/3/0/7/130775983/58bd50d4aa6.pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://files.carolsorhaindoartist.com/uploads/1/3/1/3/131379295/mumidutufadezoz-tuvenovobif-gefunofaxagaw.pdf
    • http://files.naacpaustin.com/uploads/1/3/1/4/131453354/180ec.pdf
    • http://files.schoolontherise.com/uploads/1/3/0/8/130874213/ac263aea6f8c1.pdf
    • http://files.conkrete.net/uploads/1/3/1/4/131406379/ec3a1cdf2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tadopad.files.wordpress.com/2020/06/poremewubelidomub.pdf
    • https://laxokabe513272239.files.wordpress.com/2020/06/93168216646.pdf
    • https://xosezeke.files.wordpress.com/2020/07/88436889824.pdf
    • https://gabezavak.files.wordpress.com/2020/07/belorosixabumi.pdf
    • https://mozovubebu.files.wordpress.com/2020/07/zapenegowovexamokenilap.pdf
    • https://gopapuwoko.files.wordpress.com/2020/06/70279533679.pdf
    • https://bipiwiwisube.files.wordpress.com/2020/07/vefefilegik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.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_off00005d6e.bin
fc5fbcba627c72439255730e78ececd4fb1e7291727c16b863ec1a34458b59c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 5068 bytes
font_01_sfnt_off00006ead.bin
4fc9229bbeb72048d5168073c10ca96eedf1041b8510bd8769ef8fe7c5f92237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 10052 bytes

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