Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e32c309c15a2c3d…

MALICIOUS

PDF

44.6 KB Created: 2020-08-29 11:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15266b7ceba5ebebd17264eb05cad803 SHA-1: 43cdd7ec4c87a449915b59615eda137c68af4e2f SHA-256: 4e32c309c15a2c3d5c78f22e2c1873d0e9abb6ad7a485289688b002a1d5644fe
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, including a primary malicious redirector at 'https://ttraff.cc/wix?keyword=jerarquia+de+los+operadores'. This suggests the primary goal is to lure users to external, potentially malicious, sites.

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=jerarquia+de+los+operadores
    • https://static.usrfiles.com/ugd/b8c837_1cc6611f7a2b41df9ab6c8e01f7f4dbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc0a1e00c05c47cbb3a4919759a81a06.pdf
    • https://static.usrfiles.com/ugd/b8c837_06e553633be34dd69e42749317fc52fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_778eadfd0cd3492fad1978ab6ba96529.pdf
    • https://static.usrfiles.com/ugd/b8c837_530c829f3d8c4b24b6f1f7992115bfd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a52afa8c6864c83950bca15c2dd21f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceb9385c38a94f67ae156edaa31c7a55.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa6cf3ac9bec41c99a191e674a947401.pdf
    • https://cdn.shopify.com/s/files/1/0434/2844/6358/files/jefopakekafigodoxekix.pdf
    • https://cdn.shopify.com/s/files/1/0434/6819/3952/files/26848388655.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/calcium_carbonate_tablets.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2055/files/78564929289.pdf
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/openssl_encrypt_file_with_public_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/get_the_truth_philip_houston.pdf
    • https://cdn.shopify.com/s/files/1/0435/0889/1807/files/2061961142.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb9.bin
3a292461a33b66287abe67eeaa0e3b81ba1702b1cbaa1281bc85072a7efcbdf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 4764 bytes
font_01_sfnt_off00006fe8.bin
988bbfa3ebf6a3ddf8d45aba7827eda11a868ce09f762db04ee8cc72cb9ed502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE8 11612 bytes
font_02_sfnt_off000095ac.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95AC 4324 bytes

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