Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3497bf1c05bb8d…

MALICIOUS

PDF

69.5 KB Created: 2020-09-07 18:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eecdae48466d8c031e7eb908074e7201 SHA-1: 28424f731ad893a45b7ea20dbba6c950b4f4a5a1 SHA-256: 6e3497bf1c05bb8dc2d6ac232144baa8fee274a249531326c71b3d589f43d5c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/wix?keyword=abo+multiple+allele+worksheet+1+answer+key In 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/1/0436/7283/0105/files/389975892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/generic_structure_descriptive_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/ethical_dilemma_case_study.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/posote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/vb._net_filehippo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/clasificacion_actual_de_los_seres_vivos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0005/2387/files/chrome_extension_for_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/fbi_message_meme_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/34550942234.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e73fea_6d34409b02d04daab0fba03f59a44383.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/30ea26_3943bd285c1248b9b0000c1b13919889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3311/5289/files/46985770312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7312/7079/files/xakef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/index_of_ebooks_book_chm_zip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 5500 bytes
SHA-256: 0de8513805699a305a3df8a7616a9844a120d357b6841df93d198be75cc56db7
font_02_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 9948 bytes
SHA-256: 44e6b2ca6754cd1f5d929f3e40fe6e6fc2a1f65503518e43f24d7fe9206f9b57

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