Malicious PDF — malware analysis report

Static analysis result for SHA-256 479632f7a707155f…

MALICIOUS

PDF

41.7 KB Created: 2020-08-30 21:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 339bfb14d0b803cadd0d18e345cc70e2 SHA-1: 3083d76a0255ece25399b6c18b341523184aff54 SHA-256: 479632f7a707155fdc2f3a22d686bbaff9a3a6082e5ec5610fece47850a51339
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.cc/wix?keyword=variable+unit+product+cost+formula', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, reinforcing the attack pattern.

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=variable+unit+product+cost+formula
    • https://static.usrfiles.com/ugd/455f95_a896c988a09f4cad9dda6d699df93b36.pdf
    • https://static.usrfiles.com/ugd/b8c837_9616aa18dc914bb6bb01111b6d486959.pdf
    • https://static.usrfiles.com/ugd/73f3b0_614fb116c26541238ea0e45d81c8df7e.pdf
    • https://static.usrfiles.com/ugd/4c1554_913f608e6ae047e99d7f68d00bd6c585.pdf
    • https://static.usrfiles.com/ugd/ae059d_0eeded0d0cd941cb911855bd9105fa7e.pdf
    • https://static.usrfiles.com/ugd/10a4aa_bd49724019424defb4d88b931c0a4b16.pdf
    • https://static.usrfiles.com/ugd/4bb894_40407eb1ca80452e9befd2932b5d4ddb.pdf
    • https://static.usrfiles.com/ugd/b8c837_46ffed815959402a96d0ae1f5e3eee2a.pdf
    • https://static.usrfiles.com/ugd/ddb60a_8168549118ca4d4186fa3dcd4cd4aaba.pdf
    • https://static.usrfiles.com/ugd/b8c837_29aecd444e754db58b191f99b7b6af47.pdf
    • https://static.usrfiles.com/ugd/80bfa9_f9f424a402fa41dc948e508429bdb4ca.pdf
    • https://static.usrfiles.com/ugd/3b47cb_dca1b37ea50340f4903c8f80936362a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c33b2911070047f5bcef2f751b8f7695.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_off000062d0.bin
71a287011a12e50f01527f578c9e3acb6bb80b004b61606f0acc57e1742cc6fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 5408 bytes
font_01_sfnt_off00007514.bin
fa0cb87565483d61c5a444bc7c7de0309d1511f4aec0c125b265c6d0f177a251
pdf-font-stream PDF embedded font (sfnt) at offset 0x7514 10808 bytes