Malicious PDF — malware analysis report

Static analysis result for SHA-256 de38550417d0cf30…

MALICIOUS

PDF

42.6 KB Created: 2020-10-03 08:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44d0993f244ee843545e19fbd088e1f5 SHA-1: 590b741e585de50fa3e5b3177bd2d3cffacab4ba SHA-256: de38550417d0cf30cad4bad26cebd13867e0d334a630b9c485e33afabf88c328
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating an attempt to lead the user to malicious infrastructure. The embedded URL points to 'https://cctraff.ru/strik?keyword=genetics+vocabulary+review+answer+key', which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure.

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://cctraff.ru/strik?keyword=genetics+vocabulary+review+answer+key In PDF document text
    • http://files.evoshieldcanesscott.com/uploads/1/3/0/7/130740255/5920872.pdfIn PDF document text
    • http://tuzevin.aawte.org/uploads/1/3/1/6/131636644/7cbaa31762b7.pdfIn PDF document text
    • http://files.nenlogistics.com/uploads/1/3/1/4/131483053/1111123.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/1/0498/7453/4558/files/32562133676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4514/3206/files/pickens_county_detention_center_address.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6153/8727/files/70887736545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6450/6006/files/guxatudututibedobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/physics_part_1_by_resnick_and_halliday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95a7a99-f6fc-48c2-823e-bc4984b7e713/64904197502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db78706a-0cb2-4af2-9dbe-17ddf16203ef/20018212265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867865c8-4c1f-420d-ad0a-e62347ceb011/kutulipaloxamexatafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3353720-f24d-4564-b84b-5007eaa81881/92378276013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee9209e-9612-4d84-8944-20e3dd2eff3d/80468062637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2384/2718/files/3395827496.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/cable_one_tv_guide_pascagoula_ms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4993/4744/files/xetir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7801/6419/files/1365298512.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/my_hero_academia_two_heroes_full_movie_stream.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_off000068a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A7 5284 bytes
SHA-256: 6fc0eb902753a4e56fdf3c72f9bfde665897de581bff0cf3c7073723392c2789
font_01_sfnt_off00007ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD1 10096 bytes
SHA-256: 21c4f2a1ab1c39a263010d9c076ea607b5efa5efb0087ac1066942a1b31a1da0

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