Malicious PDF — malware analysis report

Static analysis result for SHA-256 51834b7e3bdbba39…

MALICIOUS

PDF

43.8 KB Created: 2020-10-07 03:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 25bc09632c552db3277c0089e9fb57e4 SHA-1: 9075f601ccd993f8c022b3fd5383e8e2a73d8f60 SHA-256: 51834b7e3bdbba394529c98c9a07aa0ffb16a4b4b9c54fc401ff5fcae64f691c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=np+random+normal+shape In PDF document text
    • http://files.todmancounsels.com/uploads/1/3/2/3/132303229/kufivazaxix_gizojagijo_sazavaw.pdfIn PDF document text
    • http://files.therapeutichooves.com/uploads/1/3/1/3/131398477/19220d.pdfIn PDF document text
    • http://files.plainsedgechiropractic.com/uploads/1/3/2/6/132683140/bipejomolujivesobo.pdfIn PDF document text
    • http://kaketij.stephenwyrczynski.com/uploads/1/3/2/7/132712336/266a93e956b.pdfIn PDF document text
    • http://guxexafeg.newbridgepune.com/uploads/1/3/1/3/131380284/bebefebibedijak_rolasokibeboli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/68246049028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8678/3673/files/garmin_echomap_73sv_-_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/8918/2879/files/binh_minh_quan_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/30649254184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4881/9611/files/cub_cadet_snow_blowers_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2759/4905/files/new_deal_apush_saq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7638978-ac5b-4021-bab9-25eb4f6be298/44812473391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a985cd8-640e-4013-809d-cff9f912a10e/tixazetexogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b70fba-73ad-40ce-a371-0b805a6ee584/70766591807.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_off00006c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9B 5168 bytes
SHA-256: 7c48a8322a5c3aa071c0abea38f70c766fd7c567829936f81f5ad02ac2217565
font_01_sfnt_off00007e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E02 10592 bytes
SHA-256: dd8e8d4e1b11636480cfe229a4a7d9243116170fb424152795630f695bdc0c91

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