Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c3e82e403e7255…

MALICIOUS

PDF

45.5 KB Created: 2020-11-07 09:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d545ba329e472628ab15dee9f3283fbb SHA-1: e8e773282ef67eed03088bf2652826e2359d74f3 SHA-256: 06c3e82e403e72557b6f19720ce161e760a28a42ff74b95178f27111d8a972e6
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate this is likely part of a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=longmont+snow+totals In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5f9f19c50e9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5fa623e1e5401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f8bb30b530d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8cbd566d892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5f8f8b6391f85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fa31648b46d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_5f9db24d0df53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rejeben.files.wordpress.com/2020/11/nojekavoxe.pdfIn PDF document text
    • https://ririvolo.files.wordpress.com/2020/11/raxetapufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92124ecc-e01c-4cf0-aa65-3a21fe1eecb8/state_of_no_loss_acord_form_fillable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d386a52-3db9-4501-ae3a-174b4c97e106/acura_dealer_parts_catalog.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://pefukiketez.files.wordpress.com/2020/11/loliv.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/50109339811.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_off00006ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE2 4944 bytes
SHA-256: e92f2c25dc8f5d3f756e232de384702c74b7869e8b58f27e267c50e1e0231770
font_01_sfnt_off00007dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBF 13896 bytes
SHA-256: 33d6ba44d6f1cd514cef9fe9086980fd3362ac1b54acb37714f357c2a69f3684

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