Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafbcf6cefc6ad95…

MALICIOUS

PDF

38.9 KB Created: 2020-10-01 17:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50b8404a0fbcf9b49ff68875fa48c228 SHA-1: 188db396f32e963c431966ef59138336b6ca6d3b SHA-256: fafbcf6cefc6ad956645c999f7da1adad83cdc61e7e4ff9102e8d14ff7db1cf7
154 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as legitimate download links for software like Adobe Acrobat Reader, but redirects to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the primary URL, https://gettraff.ru/strik?keyword=download+acrobat+pdf+reader+8, is known to lead to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/strik?keyword=download+acrobat+pdf+reader+8 In PDF document text
    • http://files.swasgroup.co.nz/uploads/1/3/1/3/131379340/jasana.pdfIn PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/nivitemipewofovogema.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/73126651928.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/1/0483/6648/5655/files/lemefozafirugasoroma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/kuxivubodagolofexotoru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1170/6527/files/38925711529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4174/1205/files/nba2k12_my_player_cheats_ps3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/nabunariwisomipofov.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_off0000595f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595F 5396 bytes
SHA-256: 90b851a451430b31a762f6afa6fd0066fd5fa9a63467df31f7ada96cf38ea75a
font_01_sfnt_off00006bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDF 10528 bytes
SHA-256: c2ca7223f2b82e059eed938e75ecf39f51215813278dd3d3949772c19d8e7ad9