Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2364b7e2fbca59…

MALICIOUS

PDF

45.7 KB Created: 2020-10-28 17:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d7ff3304d76b2c021f9661c08924fc70 SHA-1: 4e802c6467d92a0f9416d5c2e26e2ea67d7d35c1 SHA-256: ff2364b7e2fbca59b6b74f4bab590a2b1c510d0be02e392b764b91ccf60b5cc2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document appears to be a link farm designed to redirect users to potentially harmful 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://cctraff.ru/123?keyword=d%2526d+3.5+heroes+feast In PDF document text
    • https://niviraxaxupo.weebly.com/uploads/1/3/4/4/134469592/1325719.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/5105779.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/kidorulajekosu-zilumevi-tegobowobuzasu-gokewipobitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f8c8f090c87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f916e0a07790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8749552adfa.pdfIn PDF document text
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/8009581.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/bilow.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/1/0484/9929/4363/files/bebewupesukovuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1547/4847/files/nimusenuzuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4415/0689/files/vixisezusalavof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3134/3516/files/61702027395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8523/2811/files/kawefikevir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2882/8319/files/puff_the_magic_dragon_plane_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4118/6215/files/baxoxusukexebalerudoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8628/9333/files/2571382992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2812/3295/files/spinal_anesthesia_anatomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6780/0736/files/xezuxumemajazusa.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_off00007852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7852 4156 bytes
SHA-256: 7b9a78bc71d00e4bcff8473d51fc82c270a18144a13d22e5cfd906eda86eaada
font_01_sfnt_off00008680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8680 10640 bytes
SHA-256: 4d843342503064c84dcdbf705aba0977401f0f204e827611de30ecf7e26f3214

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