Malicious PDF — malware analysis report

Static analysis result for SHA-256 db19cc552000a20c…

MALICIOUS

PDF

49.0 KB Created: 2020-10-16 01:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1100fa4483e162c922c71f1021c764ce SHA-1: 57f3e768c26e3687b1ecf2b3479ecb38bdf44dfe SHA-256: db19cc552000a20c7e2a206ef6261afdfcbac5771d51d64b9bfc4527fade0a26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to a link farm strategy designed to redirect users to malicious sites. One prominent URL, 'https://ggtraff.ru/123?keyword=microsoft+pdf+printer+windows+server+2020+r2', is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to exploit users through deceptive links.

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/123?keyword=microsoft+pdf+printer+windows+server+2020+r2 In PDF document text
    • https://site-1038470.mozfiles.com/files/1038470/norukisog.pdfIn PDF document text
    • https://site-1041782.mozfiles.com/files/1041782/fobarabiwutipelakufaj.pdfIn PDF document text
    • https://site-1039861.mozfiles.com/files/1039861/suxolowekipewuluruxodoxa.pdfIn PDF document text
    • https://site-1040663.mozfiles.com/files/1040663/mepil.pdfIn PDF document text
    • https://site-1040096.mozfiles.com/files/1040096/90882035440.pdfIn PDF document text
    • https://site-1040360.mozfiles.com/files/1040360/88320194196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8807162f148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f876d337f0c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f871ab25ce81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f88cc8bdb6ce.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/1/0485/9910/5701/files/64490065239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7867/1783/files/tidokozubedegefufiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5246/8901/files/91992359828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7990/8504/files/3163134514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/2565520604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899fc9d4-0bd4-4918-80a9-26feafc9b819/kobuwonosuwijubugavub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67c86b7-946a-4d41-b299-ceab2e0d1572/xixakiwarimimapalelixil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90ebe93-4b87-41d4-987e-3ce0b71ca80e/gudavuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a430359e-718b-4053-8f78-cbce48505817/69770298423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8798af-4945-4f23-89ec-d697ba4d9718/vosovixuwobaz.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_off0000804d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x804D 5340 bytes
SHA-256: b079d1d5826d0c4420017980ab85ff4b59e0a08977fa5d32207da10b07bf0299
font_01_sfnt_off000092a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A9 10384 bytes
SHA-256: 2e3a19e9b70111c75d88729de2c2459729e9cc8f58a78c93a9b96af775a72f85

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