Malicious PDF — malware analysis report

Static analysis result for SHA-256 173d6099c010730e…

MALICIOUS

PDF

42.3 KB Created: 2020-10-12 21:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0cf42e3e14fb55c9893a4f7339cc1409 SHA-1: 780897e2b5744e955c96124993e0113cda5ba91a SHA-256: 173d6099c010730eea66219e2914ff8df873d293c772918f18cdbd3700e1fb49
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to known malicious redirector infrastructure. The embedded URL `https://cctraff.ru/strik?keyword=zte+axon+7+android+8.1` is a critical finding, indicating a likely phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=zte+axon+7+android+8.1 In PDF document text
    • http://nimaludut.mischiefcornerbooks.com/uploads/1/3/0/7/130775198/b5ad714cfaf9.pdfIn PDF document text
    • http://somagek.miss-pj.com/uploads/1/3/1/1/131163857/6189768.pdfIn PDF document text
    • http://files.depotruth.ca/uploads/1/3/0/8/130814390/tuzukaguwofi.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/191dc8d8-bb63-4faf-85f5-fcb0257b6e9d/pufoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5776afa-1395-441e-9f9b-b84fbaf0ff13/6018579981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4de66f-256e-4428-8bc4-bb33388fa15d/gozenesikepapepotefik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5c51ac-1597-4f69-ba9e-77603a4c01df/vesuruwinaxoronisilura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc93ab9-102c-475d-96d6-e836b431d8a6/wuzajowikajusigusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b57843-1008-4928-b1e1-35f705b795eb/gitulozizove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dd7254-981d-4020-b385-07b058c8b63f/78498873727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0422120-68d3-4563-b673-fd25934003d5/fikivaxogiwudodilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1489/2953/files/kentucky_point_series_mtb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8567/0816/files/borora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2785/3223/files/summer_camp_flyer_psd_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5262/4803/files/glass_foaming_soap_dispenser_with_metal_pump.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_off0000646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 4992 bytes
SHA-256: 066a24b0346d9039aca8b0d47a9f15817fe3d40c1a685c9087dc0ce5b2c00456
font_01_sfnt_off0000758d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758D 12096 bytes
SHA-256: 38b1bc001407e7d2bf35d7881675c11033ada5a3aac41beda294e377188298d0

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