Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8aebda39a99277…

MALICIOUS

PDF

56.4 KB Created: 2020-09-30 12:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 952804b11e44eba890611f9e469fb796 SHA-1: ead4135f4c85551e09be013134840f022bd0f593 SHA-256: 0c8aebda39a99277291ff24f3799874602d9ca66893fc86c29829d583c035e40
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ggtraff.ru/strik?keyword=active+and+passive+immunity+pdf', suggesting a lure to a malicious site. The presence of many external PDF links also indicates a link farm, a common tactic for SEO manipulation and distributing malicious content.

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://ggtraff.ru/strik?keyword=active+and+passive+immunity+pdf In PDF document text
    • http://files.jessicastockton.com/uploads/1/3/2/7/132710779/jawodokiwubisuf.pdfIn PDF document text
    • http://files.mylarkapparel.com/uploads/1/3/2/3/132303238/nadavadile.pdfIn PDF document text
    • https://site-1036972.mozfiles.com/files/1036972/fipisugi.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/3527849318.pdfIn PDF document text
    • https://site-1038682.mozfiles.com/files/1038682/bedipinelebiwupele.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/32913601114.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/1/0438/4292/8790/files/23883389186.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/saki_saki_song_mr_jatt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1207/4905/files/pegibisaribisanasafe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7396/8030/files/shes_so_heavy_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40710400-6225-4faa-918f-9cf00f099600/61013458417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42197da-0fd5-4bc2-a90e-0f12639bc376/16385931059.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B72 5324 bytes
SHA-256: 3406b5769585fdc2b8924d1c8a5f624b101f842e3fbe2dcee02da66a1b86cbc8
font_01_sfnt_off00009d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D98 10012 bytes
SHA-256: 4c8dc3f66606f81d5bf2e0428bcb8d0893a3b5cc19b0159eff57d98fecbd6fc4
font_02_sfnt_off0000bff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 16148 bytes
SHA-256: ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0

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