Malicious PDF — malware analysis report

Static analysis result for SHA-256 3490d1c626edf18f…

MALICIOUS

PDF

39.1 KB Created: 2020-08-29 03:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab9a356bde62d5cf690cb8325d9c677 SHA-1: 166ca9073dd6e586b81a2ba1febc0babe06665d1 SHA-256: 3490d1c626edf18fb3f880b663a7cb49b01d486f7f5d734710b7917dc6987bf3
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.ru/wix?keyword=magnolias+de+acero+pelicula+completa', suggesting a lure to external content. The presence of numerous embedded links, many pointing to Shopify domains, further supports the attack pattern of a link farm designed to obscure the malicious redirector.

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=magnolias+de+acero+pelicula+completa
    • https://static.usrfiles.com/ugd/b8c837_40dbcdf10ff84d5dbb6ccb3f84381f72.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed20c1791e7246ed816be19494ce6b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_623562211cd74c198580d61541629065.pdf
    • https://static.usrfiles.com/ugd/b8c837_d603d55f2d9e4556afd594a153c3224a.pdf
    • https://cdn.shopify.com/s/files/1/0462/9174/6977/files/63238024341.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/pamib.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/52462464822.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/animal_sounds_free_wav.pdf
    • https://cdn.shopify.com/s/files/1/0433/3528/6943/files/17236494152.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5868/files/stampy_lovely_world_seed.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/99343698282.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_off000058ad.bin
a609aface10a1af12ca79f19e76ecc904906c7dedf331c35e00089cc215e5122
pdf-font-stream PDF embedded font (sfnt) at offset 0x58AD 5396 bytes
font_01_sfnt_off00006af8.bin
93618b2c8fd9860d63e9cf62ebf41948427b58ea175b5133f30a46bb49e4e8b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF8 10932 bytes