Malicious PDF — malware analysis report

Static analysis result for SHA-256 69487fa4cd8494a3…

MALICIOUS

PDF

51.5 KB Created: 2020-10-10 04:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e893e20179ffbe75880e6f5585c8299d SHA-1: 9264a218b060b996753943bf1cab81621941e471 SHA-256: 69487fa4cd8494a3bc6b14e236a74defbda3908aa1ce4c2e48aa4cb7bbb5f539
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=cartucho+nellie+campobello+english+pdf', which is flagged as malicious. This suggests the document is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

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=cartucho+nellie+campobello+english+pdf In PDF document text
    • https://site-1039514.mozfiles.com/files/1039514/16179909816.pdfIn PDF document text
    • https://site-1038967.mozfiles.com/files/1038967/xexekuxeve.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/52865183426.pdfIn PDF document text
    • https://site-1043259.mozfiles.com/files/1043259/31276335251.pdfIn PDF document text
    • https://site-1040687.mozfiles.com/files/1040687/wibaku.pdfIn PDF document text
    • https://site-1039768.mozfiles.com/files/1039768/51158934619.pdfIn PDF document text
    • https://site-1038979.mozfiles.com/files/1038979/53700473341.pdfIn PDF document text
    • https://site-1039954.mozfiles.com/files/1039954/57211919530.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/86fff7c2-c82c-4c2a-a88a-0eec2c44074d/17481183520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d642e970-cda2-4791-b92d-2d233160aee1/48007677887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ebb487-22c4-4114-8568-c3911e5750b7/rafamitepajojenoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3a9b9a-6d5f-4e43-80b0-672cc363a20d/777684373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e3eb6e-a71d-4fd1-aca0-1499e06859f5/pujebiwigukazivena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52669da-518a-4c7e-88ab-562aa498108d/29875289649.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_off00008c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C18 5612 bytes
SHA-256: bafb604fbf2c1ad54b7efcb640a294520832564b204a5427d531a783e360ae50
font_01_sfnt_off00009ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF9 9948 bytes
SHA-256: 7f7e853296ed4b050fdd0fdd298fef58d75d394f595edfe2218a176ceb09710c

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