Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f2bb56e9687e2b…

MALICIOUS

PDF

42.9 KB Created: 2020-10-02 23:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e423ba7fd8806662dce68339c4c2ccbf SHA-1: 7112ae3fe79d117af06427cb3600faa93785215a SHA-256: d8f2bb56e9687e2bab3ed234840f95c5a3493a93bd1264ebbdfdf6f831831679
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting and at least one is known to be a malicious redirector. The document body itself is largely obfuscated but contains the URL that is also flagged as a malicious redirector. This suggests the document is designed to lure users into clicking malicious links that likely lead to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/strik?keyword=cathleen+ni+houlihan+summary In PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/22664537531.pdfIn PDF document text
    • https://site-1039925.mozfiles.com/files/1039925/41865738459.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/pilipepig.pdfIn PDF document text
    • https://site-1039740.mozfiles.com/files/1039740/88007843081.pdfIn PDF document text
    • https://site-1039261.mozfiles.com/files/1039261/rewuxeb.pdfIn PDF document text
    • http://files.jangrunow.com/uploads/1/3/0/7/130740456/2224b6e06.pdfIn PDF document text
    • http://files.applelandstation.com/uploads/1/3/2/8/132814468/32ee92f26.pdfIn PDF document text
    • http://ruwadoz.nmakzoo.org/uploads/1/3/0/9/130969862/dilenor.pdfIn PDF document text
    • http://pakep.en.handyshop-traiskirchen.com/uploads/1/3/0/7/130740558/sugokafik-megumadopolotiv-mulilugalamo.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/1/0429/0094/7103/files/tabla_de_tipos_pokemon_wikidex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7380/5982/files/vifesapalemofitev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0803/8811/files/34403067347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6eba031-5fcc-43c0-a6c8-5d76cf0c6f54/88705874424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eedbe26-d0aa-4a5c-b23b-a30f51939078/56169394261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb4983f-a282-4ee8-abe5-83018640383e/dutipuleridokamisuxuda.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_off000069f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 4932 bytes
SHA-256: 0fce099b1ba47e98b038fa22935afdaa4890636fead5c217efce2233c70b2eb2
font_01_sfnt_off00007a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8D 10612 bytes
SHA-256: c5676096e6d632405111b77f9926ed3d6bd4b4540348b4f6baa0140ec7a669cb

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