Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd6a66804501548…

MALICIOUS

PDF

51.4 KB Created: 2020-10-03 19:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f670ed4d2f04bb794a387b2a26f40067 SHA-1: edd6b61744ad8b47ca412ebc98deac24bf07df55 SHA-256: 5fd6a668045015482646b84d189e08f4c9f0649f28ba1c91d3cf4b601c307abf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise the malicious nature of the links and potentially engage in SEO spam or phishing.

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://cctraff.ru/strik?keyword=achatina+achatina+pdf In PDF document text
    • http://files.andersonconstructioncorp518.com/uploads/1/3/1/1/131164519/d7031c400c.pdfIn PDF document text
    • http://files.desjardinsproinsp.com/uploads/1/3/2/6/132681976/ginuta.pdfIn PDF document text
    • http://files.tepeetonka.com/uploads/1/3/1/3/131379940/dewemu-zadatanosaluboz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7793/8583/files/beth_total_drama_personality.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9692/0230/files/rujoxawefirufepesulokis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8693/2896/files/rufivudezizonofekagututig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/mabepofirisigejar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8045/6094/files/fun_ways_to_divide_groups_into_teams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/solla_solew_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d2518b-88ae-41b0-b4c7-944dcd9ec493/7547543542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d194ec-ce42-4f94-86e5-7a31bde3fb74/57257257064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28bceba-6fc9-4472-8922-84ab9a6cf737/33531202703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44a6c18-005d-498a-a65a-6712ab3cdd32/98897078808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411532ed-cf89-4e2c-abe0-5529cafd9de2/tazatonakexiwaxusodomad.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_off0000886e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x886E 4928 bytes
SHA-256: a0830629b3f63e571baccd3b7535c80e2fa6c24d07460be14bf670da9229c842
font_01_sfnt_off0000993c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993C 12452 bytes
SHA-256: 8a3ec5bd1464567abf06a38366584f4e6948b9b634ed4eb71c17f34d5f50cf27

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