Malicious PDF — malware analysis report

Static analysis result for SHA-256 6967e783fd7c1107…

MALICIOUS

PDF

51.3 KB Created: 2020-10-05 06:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6652b33f9c717c17a38956111cddda8d SHA-1: 385fa2fdf19348be676fa5c5c0857a6f45d354ef SHA-256: 6967e783fd7c11070429cda9c76462ed8ae93cc786fb12acafa998197371e5cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics, suggesting a deliberate attempt to lead users to malicious content. The presence of many external links points towards a link farm or SEO spam tactic.

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://gettraff.ru/strik?keyword=stylistics+devices+pdf In PDF document text
    • http://files.craig-thomson.co.uk/uploads/1/3/2/6/132681194/xuxoxino_wikaxe_dizovizesi.pdfIn PDF document text
    • http://sonid.lambertfarmslogisticspark.com/uploads/1/3/1/4/131454143/521a21c4f.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/11028008079.pdfIn PDF document text
    • https://site-1036655.mozfiles.com/files/1036655/88220647338.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/61824478131.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/44162853194.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://uploads.strikinglycdn.com/files/59601d2c-43cb-494a-89fb-b89ac19fdece/texopixugifupoposut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf162db3-d10f-435d-b567-cb7d1bc2b7b7/zitug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adbc386-4aea-4c50-8039-380969a7dc23/48029870082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645b13e3-1e1d-4a62-a5e0-c72527c6023f/59614866000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7954/4221/files/42416283427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/alpine_stereo_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2831/6313/files/88367414498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2653/8911/files/lake_cycling_shoes_wide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5549/6347/files/98121693756.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6606 4680 bytes
SHA-256: 4913a1b05bf7f8cdcfbc9d8b64780aa419c54b68392b2bc1833df1a0545a78d0
font_01_sfnt_off0000760b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760B 12036 bytes
SHA-256: ed4cbda5f76dce7f1cb7b816b9142ef88327fd027a98e8ef9ede04a25db13d67
font_02_sfnt_off00009c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C79 16372 bytes
SHA-256: 381eedd9418bc5e5d24f15c0e1be6b5bc4a6c77fa20e4d913b49b88c3dbbc504
font_03_sfnt_off0000b1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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