Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d76251ea23c338…

MALICIOUS

PDF

43.8 KB Created: 2020-10-27 06:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 718d25db54a0d9fa68c46c401fd294f5 SHA-1: d4e4b7342b086854dfe6a81bfc899c3a12e5a145 SHA-256: 47d76251ea23c338435b3af2e9863befe513a497bd21ba94b6a7b5f75f3e6122
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.me/123?keyword=cartas+del+infierno. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, including a large number of PDFs hosted on S3. The document body, though heavily obfuscated, contains the same redirector URL and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating the malicious document.

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.me/123?keyword=cartas+del+infierno
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f88be55e1437.pdf
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/16070.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/8494558.pdf
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/74bd4c4a7.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f86ffb8d0ef7.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f874e1cf404d.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f93b53d3f6c9.pdf
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f8e8d74d63f2.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f892d0eec14b.pdf
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5f960e1a054c5.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f93effee0b1f.pdf
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f875117d9112.pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8b3c62b7401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voropa/cancer_de_pulmon_tratamiento_quirurgico.pdf
    • https://s3.amazonaws.com/xanebavifamopez/70252627827.pdf
    • https://s3.amazonaws.com/fasanag/19677431774.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/bless_the_broken_road_selah.pdf
    • https://s3.amazonaws.com/rizijubovapuk/80066793760.pdf
    • https://s3.amazonaws.com/gumegulaxi/paleontology_textbook.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_off00006bf3.bin
2afbee18d96033e8cc6fba04958d33640114593824f31b94ae0c88533d91ade9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF3 4804 bytes
font_01_sfnt_off00007c52.bin
e4476e0ae9f45496e694b558e42131a79a2aa6f6b78d54f94afaf99e8b95b990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C52 11504 bytes

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