Malicious PDF — malware analysis report

Static analysis result for SHA-256 699faea582cfe7c2…

MALICIOUS

PDF

40.1 KB Created: 2020-11-01 08:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7852680afb1851ad944d00a63bef123b SHA-1: 84faa83b5c73bab4f6ec99a2503601fac5e86302 SHA-256: 699faea582cfe7c288d9a6748b9a21a43b7e5a2e3cf2171392c4187c80c3af81
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites, possibly for SEO spam or phishing.

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/wb?keyword=pdf%20file%20size%20resize%20online In PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/8569232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f9082dc3c1d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8704b5ebb7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f8800c9a0f66.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/5656467.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/3780b5df91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5f97701cafcb6.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://cdn.shopify.com/s/files/1/0499/2915/8824/files/tao_of_sexology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/tabej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4065/9385/files/25548015583.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_off00005387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5387 4448 bytes
SHA-256: 2faefa8de50d9eb2dd540d33d393f7cd01d3330466942d4d24511e5e7eddd689
font_01_sfnt_off000062a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 10436 bytes
SHA-256: 7dddb0df24931336cd923d4775ea5efb916712c1c8fe93b21afc22cce2841324
font_02_sfnt_off00008638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8638 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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