Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb2ef45bfe87f38…

MALICIOUS

PDF

48.0 KB Created: 2020-10-28 05:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c35b7a19fbf40024fea0e3eda9faa462 SHA-1: 87d7cb171d006b75e4262c401fd275ed02c18e9d SHA-256: bfb2ef45bfe87f38a5c795e7b038daa085b12af9cdbf647f90bb157514d84237
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning 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://ttraff.club/123?keyword=nomadic+furniture+3.0+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5f8ea2da66267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5f9461799ba65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f8bdcc7b0944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f871a8ff3a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f87acd9d135c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8e163c43d9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5f91dfefc0fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f87429eb7974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5f98e270bd34f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f8cb8af0a4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f86f52b5482e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f88f254f06b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5f98ced633bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f882a64b5652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f8f42e1a3563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f964dd2544ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f983cc96d5c9.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/1/0483/5131/4071/files/ruwaberuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8289/8344/files/biwomewulafofadani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/98106477901.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_off00006ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECE 5280 bytes
SHA-256: 1705f6624535fbeeb4fcf6fca95873d24f3cf4362777e7c8bf05098535b04a18
font_01_sfnt_off000080a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A8 10684 bytes
SHA-256: 8c7c39b291e8dc9d88d3b6ff16750daeed8b19268c9e3d00c003689bd8746a70
font_02_sfnt_off0000a4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4F2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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