Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8d0795b7f9e495…

MALICIOUS

PDF

37.9 KB Created: 2020-08-15 06:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdbe6279daafe1d49b6df726aa73826a SHA-1: 423fe1a40777f95847ded45a727b5494d0870c49 SHA-256: 5b8d0795b7f9e495ed9c01a406874a6fcec4b3489f0b746fec73891e73162f23
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier strongly indicates malicious intent, and the presence of embedded URLs confirms the document's purpose is to redirect users.

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://ttraff.com/wb?keyword=twas%20in%20the%20moon%20of%20wintertime%20sheet%20music%20pdf
    • http://files.breathefreeme.org/uploads/1/3/2/3/132302987/wixejunusoruw.pdf
    • http://files.pacificcountycovid19.com/uploads/1/3/1/3/131379803/napimavuwolobidexo.pdf
    • http://files.colliervilledragonsyouthtrack.com/uploads/1/3/0/8/130813923/jidopiw.pdf
    • http://tizokiru.scoutunit40.com/uploads/1/3/1/0/131070152/pinuxixol.pdf
    • http://vusekubi.javascriptsandmore.com/uploads/1/3/2/7/132712358/5e6de51.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/97275202473.pdf
    • https://cdn.shopify.com/s/files/1/0451/7848/6933/files/19104178341.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/lamibudasogavela.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/97154428164.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/15177334049.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/lupidikomekapupagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/fojuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1205/files/pabureduluxuzagego.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/52005275467.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000561c.bin
8971a33912271031294b9a0eefe1efa9059899671f478a49db84a6f223d84e61
pdf-font-stream PDF embedded font (sfnt) at offset 0x561C 5404 bytes
font_01_sfnt_off0000685f.bin
c9ba6648b9c933c95848354a806d253231a123014259a839d961411c312bb5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x685F 10052 bytes