Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fc63713c526379…

MALICIOUS

PDF

41.2 KB Created: 2020-11-08 12:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0f27f19eccd02972d57366deb1882e14 SHA-1: 923d23814fe31df8c515ffd02f03dce31ea4a131 SHA-256: a4fc63713c526379c75289c5f7ab18e93d86bc41220f477ed67bdf2d81d88f44
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://trafficel.ru/aws?keyword=cops+and+robbers+minecraft+pe, suggests a potential SEO manipulation or content redirection scheme. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=cops+and+robbers+minecraft+pe PDF link annotation
    • https://gafanotode.weebly.com/uploads/1/3/4/5/134576189/fe44c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f906a600927e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f8efd6206711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5f95cbaa2831a.pdfIn PDF document text
    • https://wogivanozo.weebly.com/uploads/1/3/4/5/134586267/3483255.pdfIn PDF document text
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/xebabotum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fa52cf15d74b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_5fa1f8b19cd21.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/40b0bfbefc016e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fa7602982c9b.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/686df1a2-534e-4bf1-870a-0cfed4d7da15/bottom_up_processing_example_in_everyday_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69026ff-7caa-4338-b70a-c841a4eb6b33/columbus_day_expeditionary_force_ali.pdfIn PDF document text
    • https://kuzosetaz812614874.files.wordpress.com/2020/11/layla_acoustic_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23302eac-9609-4c87-bb30-5242a5f1ef2b/53623050151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc87c39-a05e-4381-ab4e-37056b5d915a/preschool_clothing_worksheet.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_off0000592a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592A 5316 bytes
SHA-256: c841fc4744752c37242fcc1b4552814435946fa683375922ea49cd7a60df0aae
font_01_sfnt_off00006b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B15 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000073a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A3 10612 bytes
SHA-256: 9663894aa44509184e9b9b0b947f148353ebee85527125aade90f9ad748c7af6

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