Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbaf6859b608198…

MALICIOUS

PDF

72.4 KB Created: 2020-08-11 00:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aab93d3609045651a6bef7302436a30 SHA-1: 78792d6dbc5c9c50621d2d659b6bf5b6c7e6ca54 SHA-256: 2fbaf6859b608198492974ca240bda676e3075b55ff3419b97986e7ca79e16fa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm designed to improve search engine ranking or obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is further obfuscated by a keyword related to preschool education. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attempt.

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.ru/pify?keyword=aprendizajes+clave+educacion+preescolar+pdf
    • http://files.nephro-pathology.com/uploads/1/3/2/6/132696274/xutiditu.pdf
    • http://files.tamueventing.com/uploads/1/3/0/9/130969656/jekiwezuvutitine.pdf
    • http://files.caninearthritisandjoint.com/uploads/1/3/0/8/130813409/9348804.pdf
    • http://buvet.southernnaturals.com/uploads/1/3/1/8/131871650/wetilabuletu-giziwamafobimip-vazotet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/deved.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4805/files/chemistry_principles_and_reactions_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/kelis_caught_out_there.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/92397277742.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/fupexifuvalabilirat.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/36699124726.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/2020_cadillac_sts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/nekolusirel.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/mercer_weighted_grade_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/balevogigadan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/8553135531.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd62.bin
1006c4461063491d5e33b7961b28991abe55e659365e64a78e7158088d0f89fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 5124 bytes
font_01_sfnt_off0000dee0.bin
a027457c881a3d43ffc87081f4a05dc95266cdb32277709ec41e6417c7744a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 11632 bytes
font_02_sfnt_off00010431.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 4324 bytes

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