Malicious PDF — malware analysis report

Static analysis result for SHA-256 a381145e920a943b…

MALICIOUS

PDF

42.0 KB Created: 2020-10-07 18:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5331e502f0fbea609591cabe1461b664 SHA-1: 7ecb3d9d0c87c4f68c5fe8d4b2f0f0a66c997388 SHA-256: a381145e920a943bbcba8729ad98ed7163610c0026625657f3020600151f801e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection chain. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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/strik?keyword=drake+forever+download In PDF document text
    • http://guxuvaw.elizabethdenholm.com/uploads/1/3/0/7/130740510/c6894c5.pdfIn PDF document text
    • http://lafenu.tianamarie.co.uk/uploads/1/3/2/6/132696147/zanuxajol-fimip-kedutofufuwol-damogusogu.pdfIn PDF document text
    • http://files.nityakumar.com/uploads/1/3/0/8/130874413/kidokadi.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/ffdbc5f7-0ad0-435f-913c-ad705a09c1e2/79129992967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb076d6-5612-418f-80c5-a10ec81f6eff/xonepibuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41bea708-f631-4db0-8e02-d33b13281647/fijebijipijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a41c8a-176e-4130-9b0c-a6b0bccc39d5/kufizunejadutojifisiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff201c36-79b2-46c5-b63c-df8a8777c367/7911196715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0aed54-ee80-400a-9c7b-d93928a66953/kunomedosuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2112/5792/files/foil_literary_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/silver_pug_puppies_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/chastain_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8389/6734/files/98675385930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9276/1494/files/employment_contract_for_sales_representative.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_off000047f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47F0 4940 bytes
SHA-256: eda0563c10eabf9c2a08048e9ba563d345d0a17e3c65ccc74db9085ef9124897
font_01_sfnt_off000058ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58EE 10276 bytes
SHA-256: 121df188297a4a742a2f28cbf2be710f7fe388a2e18d41f68505bc10f3337162
font_02_sfnt_off00007c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1E 18776 bytes
SHA-256: e58e8e8d3617fa2f52d62469859eb662c26c1c1537dc21f5cc6f1aa71eaa6aed

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