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) First seen: 2020-09-04
MD5: 98dccaea0e3745c56569f6dbd2ee94b0 SHA-1: 8900f32d79a30e6b047e31dfb11b91db1b4db98c SHA-256: 6833205144b1131b01d314c71090eda7c06f2b3e13e99d09046b5e0e4399f75c
184 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 disposable domains and redirectors, indicating a link farm or SEO spam campaign. One prominent URL, https://ttraff.cc/wb?keyword=factor%20linear%20expressions%20with%20rational%20coefficients%20worksheet, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, while partially corrupted, suggests a worksheet lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.mybestdoodle.com/uploads/1/3/0/7/130775983/58bd50d4aa6.pdfIn PDF document text
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdfIn PDF document text
    • http://files.carolsorhaindoartist.com/uploads/1/3/1/3/131379295/mumidutufadezoz-tuvenovobif-gefunofaxagaw.pdfIn PDF document text
    • http://files.naacpaustin.com/uploads/1/3/1/4/131453354/180ec.pdfIn PDF document text
    • http://files.schoolontherise.com/uploads/1/3/0/8/130874213/ac263aea6f8c1.pdfIn PDF document text
    • http://files.conkrete.net/uploads/1/3/1/4/131406379/ec3a1cdf2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tadopad.files.wordpress.com/2020/06/poremewubelidomub.pdfIn PDF document text
    • https://laxokabe513272239.files.wordpress.com/2020/06/93168216646.pdfIn PDF document text
    • https://xosezeke.files.wordpress.com/2020/07/88436889824.pdfIn PDF document text
    • https://gabezavak.files.wordpress.com/2020/07/belorosixabumi.pdfIn PDF document text
    • https://mozovubebu.files.wordpress.com/2020/07/zapenegowovexamokenilap.pdfIn PDF document text
    • https://gopapuwoko.files.wordpress.com/2020/06/70279533679.pdfIn PDF document text
    • https://bipiwiwisube.files.wordpress.com/2020/07/vefefilegik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82127534182.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 5068 bytes
SHA-256: fc5fbcba627c72439255730e78ececd4fb1e7291727c16b863ec1a34458b59c1
font_01_sfnt_off00006ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAD 10052 bytes
SHA-256: 4fc9229bbeb72048d5168073c10ca96eedf1041b8510bd8769ef8fe7c5f92237

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