Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3726991ffe86985…

MALICIOUS

PDF

58.4 KB Created: 2020-11-02 19:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d8d52e1201c2efe970c4aa379a2e2920 SHA-1: bb3254d26640a631bd3784f3f13bb8951e93e6c9 SHA-256: a3726991ffe86985c673c165211d0f0e27e1c8fb8e3b9d27edda5660382f2a5b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm. The primary malicious URL identified is https://cctraff.ru/strik?keyword=biomolecules+worksheet+middle+school, which is likely used to distribute further malware or phishing content. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a 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=biomolecules+worksheet+middle+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f890261c8ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f9185fa22ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f9632e8c0869.pdfIn PDF document text
    • https://naxupezo.weebly.com/uploads/1/3/4/3/134350891/1613985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f904a2990263.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6656519c-e1a4-4136-abee-fee9a81ff56e/29335885652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0805dfd5-d184-46d2-8d87-29ca8312e9ab/6084680791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7113/3597/files/symptoms_of_protein_energy_malnutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/map_of_southwest_asia_middle_east.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/79189991285.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/gutajurosemisixoxavofaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6936/4632/files/28955545693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6534/3639/files/bullworker_x5_manual_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/8773/7255/files/pathfinder_armored_coat.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_off0000a513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA513 5172 bytes
SHA-256: 855572676e6dfc0615ac3bfa406dddd97e7dac09af6ea09505d62e5f08042902
font_01_sfnt_off0000b692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB692 11152 bytes
SHA-256: e16a118e2c6b5e22eb820d1fdc6df4c2bcdc9a5a7a1f3e31647a595106f63202

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