Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb30485cc278f59…

MALICIOUS

PDF

73.6 KB Created: 2021-01-01 12:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: db741a5bc9c302c06e09b71dc3936524 SHA-1: 5ed657669f3c437fa5e3396cc5d1a6de8a4aeb22 SHA-256: cbb30485cc278f59c55a1da0a2d9aa422733655cd64110a993a9feacf581922f
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded URLs suggest it is designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=fear+the+walking+dead+season+4 In PDF document text
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/fakoxosojutir.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/dobor-xozebo-belogu-fusojitonudaxo.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/lipinezovujinek-xeponodobadelu-fewubofis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc5e85312064.pdfIn PDF document text
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/1e33c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd61b623432e.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/3bcb25f.pdfIn PDF document text
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/8550292.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/sE2jho9/7_days_mystery_puzzle_interactive_novel_story.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/bevekis_supusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/telasebisu/causative_form_have_get_something_done.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2c65ae-c7c5-4c78-9980-53264b65720a/badoo_super_poderes_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/trash_masher_manual_trash_compactor_device.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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 5288 bytes
SHA-256: e27465478c15e649b6bd84a2b6c0f34f319f87b050e37a9317f9f22a7255c54a
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10760 bytes
SHA-256: d0c6bf08fc1b8b735e6f9c92c727d7742fc65289865ec6a4b195d08f45cd3c62

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