Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f31fbed1b577fc…

MALICIOUS

PDF

67.8 KB Created: 2021-01-09 03:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 78e675c2313269a27cb66c44c5650ca7 SHA-1: 94379306be4d3f3e0a9510f82840db63e9d4e16d SHA-256: 43f31fbed1b577fc1f512112e55ed4ce8dbc1061673cb3f506857761fb5369b7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to direct users to potentially harmful sites. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/wb?keyword=brain%20it%20on%20level%2057 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471085/normal_5fc53cf31a5a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ff8de64998f5.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/8492243.pdfIn PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/misojewif-gokasije.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/gegidekidumirugimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5fbf07cba3a12.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/lewidumivena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b069427f-d87d-4c4f-bd40-1818f5ca9cfb/el_paso_county_warrants_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89aae68b-d21a-4720-847c-d6b8a7141aa5/88327512779.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/cattle_production_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40afb2d-ec11-4fff-b3c7-f040d847a566/fatumagefinuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f039067-7076-4b1a-8fc3-88803e377a11/bed_bath_and_beyond_specific_college_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e806bf5-345d-4e73-baa5-38abfdeb3a14/nezoximadogeratup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AD 4604 bytes
SHA-256: fded7e076be3253c35160733b0971e74cf64777043cd8981becbdcd92143e36d
font_01_sfnt_off0000d064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD064 10628 bytes
SHA-256: fe76c427c8f64c650b5cccce069287ca23ff661de3308625946c6032358f2fae
font_02_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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