Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dde0c95954df876…

MALICIOUS

PDF

44.8 KB Created: 2020-10-16 00:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4de359448f8ad499c5af1dd5033a4d6 SHA-1: 7b9f486f0255b2c63aeda78907a1e33d1a2aee00 SHA-256: 7dde0c95954df87611ead88cba801570979b7d0f67212a87aa5626aa32327c68
124 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. The presence of embedded links and the ML classifier's high confidence score support this assessment.

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 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://cctraff.ru/strik?keyword=que+es+el+indice+glucemico+pdf In PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/8fd11da9ddc9.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/4050193.pdfIn PDF document text
    • https://site-1039190.mozfiles.com/files/1039190/1591844769.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/40040234983.pdfIn PDF document text
    • https://site-1043923.mozfiles.com/files/1043923/lokuzapitinibojudo.pdfIn PDF document text
    • https://site-1042927.mozfiles.com/files/1042927/84666551409.pdfIn PDF document text
    • https://site-1039133.mozfiles.com/files/1039133/16915423454.pdfIn PDF document text
    • https://site-1038679.mozfiles.com/files/1038679/51541107134.pdfIn PDF document text
    • https://site-1040238.mozfiles.com/files/1040238/86035279738.pdfIn PDF document text
    • https://site-1042453.mozfiles.com/files/1042453/48286686424.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/98716900002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f875fe8e5ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f871952e01b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f88c0e29acb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f88b9d690e7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d413cdc-04c0-4553-be2d-075b77800c26/wegiriluwowufowibis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a296a090-c11c-40d1-a97c-2c815532ef04/31869742331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3dd3b5-f3e3-484b-a46d-8fbc7ecc2b83/wujusojamaditijis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a40784f-35b4-4400-8d46-0275a64f5ad8/86819757653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4730/5635/files/mastercam_x5_exe_not_valid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6262/3893/files/lijotolifaputiwojigoves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/el_matadero_esteban_echeverria.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5232 bytes
SHA-256: 0c7efafd897b8483fcce682b91762bc4bab325aa1a2a115988c0be4220fb55bc
font_01_sfnt_off00007e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 11924 bytes
SHA-256: 2a1c31b6c2b00e8dba57c095438849f6a0efa6d926db7b61e12bc8e78b3b358b

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