Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4930486b223a73…

MALICIOUS

PDF

53.8 KB Created: 2020-10-15 07:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 225db7df0303b2138ee4c1e38b9ef930 SHA-1: 74c197a0a2c412c2e51b9073b32d679fc3fb8400 SHA-256: ad4930486b223a734084ec6090bc0c4c8af8860b950b79cb2b28b38aed13edb1
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=bcmon+apk+3.4+mb In PDF document text
    • https://site-1040038.mozfiles.com/files/1040038/61568752603.pdfIn PDF document text
    • https://site-1038304.mozfiles.com/files/1038304/29166857354.pdfIn PDF document text
    • https://site-1040571.mozfiles.com/files/1040571/gibewelebixetimavinuf.pdfIn PDF document text
    • https://site-1037920.mozfiles.com/files/1037920/22174278366.pdfIn PDF document text
    • https://site-1038326.mozfiles.com/files/1038326/diradizojisexujijulonadi.pdfIn PDF document text
    • https://site-1042922.mozfiles.com/files/1042922/jepenufuw.pdfIn PDF document text
    • https://site-1039227.mozfiles.com/files/1039227/82723985199.pdfIn PDF document text
    • https://site-1043790.mozfiles.com/files/1043790/kipokebuwerevelorugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f87633f996cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f87a32cd4cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f879a9d1f6ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f87c66a1b751.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/c21e16b6-dfd6-4601-9d64-4f542b0b5928/poxewosowekilisem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f9dade-d1ae-4161-a282-7604fd91152f/wekesigub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c44cf4-33cc-4b53-8cbf-cca360ef1f06/83407591682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd63e0ee-3298-4a98-a6db-e0c488f8c74f/bovil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41179111-03f1-4a19-8284-c2d13163ac86/75846317798.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/fifa_17_beginners_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5474/3200/files/45575527350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4749/3536/files/navy_manning_levels_by_rate_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684e4e5d-f707-4d2b-8a3e-952363eeeabc/96997856185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f6dd43-5032-4459-9a5e-ea49ad6d4fae/43395646371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7473066f-26e6-494d-a79c-991fcb2a11dc/sewunave.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_off000077d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D3 5308 bytes
SHA-256: 63c297c4b3ccc1bf3469211c160068eb6576f65a7d50f1f628988899d6d386aa
font_01_sfnt_off000089dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 10504 bytes
SHA-256: 187999685e268848a33849432cb679c27a2829c759e96803309f6cda6dc7ebfa
font_02_sfnt_off0000ae0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0E 18080 bytes
SHA-256: 81baf1ac42dec84b2e43a102217994e3cdbc50ab79f33660565b849eb775fe13