Malicious PDF — malware analysis report

Static analysis result for SHA-256 439f7609e819760a…

MALICIOUS

PDF

79.6 KB Created: 2020-10-10 07:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec0ae6503ef9bb603fbde6d9ee5a4557 SHA-1: 300722c22e93ae878963187620e35d73d18f52c4 SHA-256: 439f7609e819760ab94838ace3c97c2d35891a298116d63a7118364a174a9217
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains embedded links. One of these links, https://ggtraff.ru/strik?keyword=bug+buzz+pokemon+revolution, points to known malicious redirector infrastructure. The document appears to be a link farm hosted on disposable domains, suggesting an attempt to drive traffic to malicious sites.

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=bug+buzz+pokemon+revolution In PDF document text
    • https://site-1043081.mozfiles.com/files/1043081/guxaxojotepamalowote.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/sedilopobi.pdfIn PDF document text
    • https://site-1040092.mozfiles.com/files/1040092/jupowexelanufojisokizer.pdfIn PDF document text
    • https://site-1037073.mozfiles.com/files/1037073/direz.pdfIn PDF document text
    • https://site-1040038.mozfiles.com/files/1040038/72496632007.pdfIn PDF document text
    • http://files.jkabbott.com/uploads/1/3/0/7/130775169/61fd869.pdfIn PDF document text
    • http://files.postybirb.com/uploads/1/3/0/8/130874102/5b67ac14.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/31142524-5450-4900-9e78-2ac12b200e91/jibalazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6469c281-8e4b-4af4-94d6-c3a7f56315bb/74346182577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383bc2d7-c09f-4117-afa2-49f7e66e7288/sabukogufinepejoxipifevap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c870feb-338d-47b7-8e13-6b59638aa289/jisobexofaxozamawavipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9694a88-396a-4c5b-a0d7-e402190596f3/88801275349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacc24a1-f7c4-4088-af13-c14b80978983/tonafivitedaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b392c69-be85-4e39-819e-1e53fc9f813e/wawibevajadivofod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6954 45072 bytes
SHA-256: c3d8ce5364274c3a4f7e97ead7f0e3c162a2bbd24d87caac4717e1ae1bc2eaad
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 5112 bytes
SHA-256: 07066415cabd6fa1e7d68be1c13e69aca627fde46e8510c83230d95192fa3172
font_02_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 14464 bytes
SHA-256: d511ac8b3bfd34760db8348c2c59526c99ad3f8551f87234f6e12c1c95ceb718

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