Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ffbd59a58f53b8…

MALICIOUS

PDF

45.4 KB Created: 2020-10-26 23:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ef3ba13dcc2863084a0aae244e41a1ee SHA-1: 37329f5c70ba8e22e80d5db5996c25f3bbb1741e SHA-256: 85ffbd59a58f53b899d86e83247cf130ffae598229f29be47bb2018a4321c7de
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to S3 buckets and other benign-looking domains, but also includes a critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be part of a link farm strategy. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead the user to a harmful site.

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=heal+your+face In PDF document text
    • https://tigafuxofezez.weebly.com/uploads/1/3/4/3/134363272/10bae9.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/xavebix-rolusu-guguwe-sixenuvu.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/vowuj_wiwaf_wubitenikutasuz.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/posufij/67127715410.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/1120326713.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/dusufexozumilibikowekezon.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/40990683484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0586/0248/files/motorcycle_foot_pegs_with_heel_rest.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/69701151288.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/pathophysiology_of_cataract.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/cooling_tower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b1b551-fe81-445e-8034-c734e0b61cb5/nikah_nama_form_in_urdu_for_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c07321-94d4-4c18-9006-7b2ed146bf2d/rewuxeluronimamibikego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19360195-b2a0-46e6-a17b-1d3480adf41e/mabipegaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80f7038-50fb-4f66-b3df-b4d16fb24d4c/fagozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af794a94-dbbd-4cd4-822d-292cf9c34ab3/73334586172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c04882-48a7-40a8-b7ee-c1e213725618/1986_suzuki_cavalcade_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0bceb3-873c-4cf0-9c22-2dc7ae7f6068/mekedebudowowexesurikibol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7093dad2-4ff6-4462-b2e2-6322552e564e/87064979375.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_off000075b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B3 4760 bytes
SHA-256: 0020f7077d16843ab747693b4654486ede15de7a51a3b9863b0c1ff37fe6bb46
font_01_sfnt_off000085fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FB 10292 bytes
SHA-256: 90ebe183b006a067919e5cdd6d7cbb64afefcc1bbe61dbdc47e8e75277496017

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