Malicious PDF — malware analysis report

Static analysis result for SHA-256 450f1dbf3993c627…

MALICIOUS

PDF

42.1 KB Created: 2020-09-06 15:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 373d5c76a1434280f2e0720ab61a50f2 SHA-1: bf2c86725868c520a4132a618fb6f9e1f7b219f3 SHA-256: 450f1dbf3993c627e1ef6d47cf48283ae72ed5c6ec87aa34481981c9b4a8c343
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'free mystery grid drawing worksheets' and a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click on a malicious link within the document.

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.com/wix?keyword=free+mystery+grid+drawing+worksheets In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/e4ff69_ec781eb326764097bb5d0abe86780610.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/32acb1_84701c533b824c4f87828b9a958063d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dc6899_93480e4a25824e36b44f9ee22d449b6a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ba385a38c96a47f6959ba425c99e3d8d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/47e66e_4d1dd87d52b9460bb12fc994245b4814.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/409ca8_8dc2c4aedc224b11831f74b1a5931672.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/122077_a2417cf143524216b94dca223bd9aa72.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3882/5883/files/84332680309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/salrio_de_um_salrio_de_conferencia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/42452324916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/94741127185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/19671663350.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_off000066d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D5 5420 bytes
SHA-256: f25992785b72cd46c1d06515ae4b0aeb7f36bd5bb996c07ebe7d0e0ae97e3956
font_01_sfnt_off00007936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7936 10120 bytes
SHA-256: fa56d9d4374f675adfc1f8a996fc26c2633115a79e442fe5ed890789b3ab0c0a

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