Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fda6a3b9382854…

MALICIOUS

PDF

47.0 KB Created: 2020-08-29 00:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2700be9235a960aa25dc3072008f8852 SHA-1: beab9aac32e783e51dac63d7f61dba5026c5fd23 SHA-256: a8fda6a3b93828541b703ce7d5395456a191b31af24bac0ac980fca10c52660f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, 'https://ttraff.cc/wix?keyword=videos+de+luta+livre+mexicana+mascar', is identified as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with many links pointing to external PDF files hosted on platforms like Shopify. The primary attack pattern appears to be SEO poisoning or link farming, leveraging a malicious redirector to potentially lead users to harmful content.

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.cc/wix?keyword=videos+de+luta+livre+mexicana+mascar
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/82194201892.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/28336265316.pdf
    • https://cdn.shopify.com/s/files/1/0431/7177/4615/files/5843774350.pdf
    • https://cdn.shopify.com/s/files/1/0459/1462/0053/files/batman_the_dark_knight_hub.pdf
    • https://static.usrfiles.com/ugd/b8c837_2162611fe1b243b7a8ade55af71b7961.pdf
    • https://static.usrfiles.com/ugd/b8c837_f146a7b574214dc48fe5ebdc21903352.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c9b3ba46b3143a5a3cb622ac9fb4cc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1225a9ef6b364cad995240a823b438a5.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7965/files/algebra_1_textbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/cantina_band_piano_easy.pdf
    • https://cdn.shopify.com/s/files/1/0441/4147/8040/files/energy_absorption_of_structures_and_materials_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/zosefug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1651/8805/files/geico_car_insurance_card_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007647.bin
cda3f6c1477f40202a781577c1bf9b69e18d479a7c2f602e58e50ac4f07e137c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 5176 bytes
font_01_sfnt_off000087d0.bin
2b244afd7684a281da737a97afa96bd24baa5366903998e1d6f16b2f6e735af0
pdf-font-stream PDF embedded font (sfnt) at offset 0x87D0 12788 bytes