Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d7ce775f6d9847…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 02:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebce46eca99b6dfbac82a2e1b0b94fa2 SHA-1: a4205ea204b285126c7c37c19a56280aa96d31b4 SHA-256: 33d7ce775f6d984799cbf2b3756004b0631ea9e7efffa4b1efd3cabcbf30e4fc
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting an attempt to distribute or host malicious 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.ru/wix?keyword=banshee+350+performance+parts
    • https://static.usrfiles.com/ugd/9b7d8a_930133fe4b7f494fb1f649c20da06265.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f0a6fa93dd4babb76a95e8490c82dd.pdf
    • https://static.usrfiles.com/ugd/5e81b9_36bcc74c9f914e89a6cee1bac0626a92.pdf
    • https://static.usrfiles.com/ugd/89064d_bedcb63951464936a1b35e04de74198a.pdf
    • https://static.usrfiles.com/ugd/3e9e83_8fce6b482df34880a4421fdad7195b07.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/hemostasis_screening_test_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/atomic_number_table.pdf
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/fapix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9511/files/dizimubuzegutimafijutope.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/77108191234.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/10093788238.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/gisola.pdf
    • https://static.usrfiles.com/ugd/3b7182_e18c133453904168828f2afcc7580635.pdf
    • https://static.usrfiles.com/ugd/0a0016_1f048a7cd9d648ecbbaedf9c490c9dc8.pdf
    • https://static.usrfiles.com/ugd/edb4a7_b340a1ba748644deab205cb2ca1941ab.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_off00006362.bin
22b43442223ef2b65ce13e0863cba0107a08c1b8f634f228febc225cf57b28ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 5700 bytes
font_01_sfnt_off00007692.bin
6cf66d82c7ccd0d0ddd88790abab0246ba9dfb1bb343da09f9e0d927f006e59d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7692 15196 bytes