Malicious PDF — malware analysis report

Static analysis result for SHA-256 25044dda6516663b…

MALICIOUS

PDF

40.1 KB Created: 2020-10-02 10:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8b642174d0f7184fb0865a1d296d42da SHA-1: e7315894b5b0de2e981a41181400c9982de840d5 SHA-256: 25044dda6516663b6cdccacc7dc94c420d5d5762a42ea9ad6a03dacffd9bfc29
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. The document body, though partially corrupted, contains keywords related to product instructions, likely a lure to encourage clicks on the malicious links.

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://ggtraff.ru/strik?keyword=walmart+bluetooth+headphones+instructions In PDF document text
    • http://pubezuja.specialtyscriptrx.com/uploads/1/3/2/8/132814930/e180b34f0a36.pdfIn PDF document text
    • http://files.dsouzaresort.com/uploads/1/3/1/0/131070719/562241d.pdfIn PDF document text
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/72777169445.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/60988001369.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/82215674690.pdfIn PDF document text
    • https://site-1037143.mozfiles.com/files/1037143/58467311151.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/sefasiwekemeraj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/43983041975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/28073617925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5717/1618/files/arizona_king_snake_eating_rattlesnake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/ocean_beach_surf_forecast_san_diego.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEA 5468 bytes
SHA-256: 701742a17053148b7e678ad649d1a35bf93bc2fca703633b06d70802660549a2
font_01_sfnt_off00007058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7058 10328 bytes
SHA-256: 76ef2ff80185abe54174d1d57a68e9c8e9886201a1486b2d6147c5fbf2242510

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