Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a02a78e892f48c4…

MALICIOUS

PDF

47.4 KB Created: 2020-10-15 03:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e1f83418215951664e4707daee14620 SHA-1: 334b23598fbb2e46291a91922ba17dcf043014eb SHA-256: 6a02a78e892f48c4043f17d77bcd120e0a9344b05a26291551cef36218023fb3
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the document body itself contains URLs that are likely part of a link farm designed to obscure the final destination. No scripts were extracted, but the primary attack vector appears to be social engineering via embedded 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 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://ggtraff.ru/strik?keyword=instructional+materials+in+filipino+10 In PDF document text
    • https://site-1039772.mozfiles.com/files/1039772/27553921319.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/10606119901.pdfIn PDF document text
    • https://site-1040892.mozfiles.com/files/1040892/sugufuwajelelunos.pdfIn PDF document text
    • https://site-1043793.mozfiles.com/files/1043793/93810969968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f879dbc7ecf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f876fe64914f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f874f175989c.pdfIn PDF document text
    • https://site-1036735.mozfiles.com/files/1036735/2640005764.pdfIn PDF document text
    • https://site-1043764.mozfiles.com/files/1043764/95002488026.pdfIn PDF document text
    • https://site-1039602.mozfiles.com/files/1039602/25212613062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f8735db95264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f872c4058cb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/657b4b7a-317f-4f8e-80ce-0043deaae5ed/20323076813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308e7a17-0e07-48d0-8fec-9412fc2455a3/54562698945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced8618b-fe0c-4b27-a71c-9e7749e20cac/mekolerejikerinurif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/322f66b5-42a3-46a9-8fd1-6af111d603cb/diwalabitomurosizaragebir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42422e79-1ab4-4997-ba0f-e6a93dff8b7e/38408147381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f21dd2-4d42-4a4a-9c2b-825b2bf89e48/bebepibakupavamuji.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDB 5292 bytes
SHA-256: 887280ef42e0d01b8a6d4e4297c97d62a0de1634a56ab280417dbc6793c97c5d
font_01_sfnt_off00007db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB4 6148 bytes
SHA-256: 0b8363bc9e07cf89205331d27bc1c31e4fc91592bb846ce71245372e642e4983
font_02_sfnt_off00008d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D93 9956 bytes
SHA-256: 48e1dbd996b97a2bd1f9780d7b31e9bb5111681323a4616f32541ace2cee9360

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