Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef787c9902fe87c6…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 22:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f233268b04c21daa724c0dabd0d4199 SHA-1: 23a378a4361641a1d62f425d21cabe38af62aaf5 SHA-256: ef787c9902fe87c668806671eddcf1000d206289464a123466e7778d93106041
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=td+jakes+oraci%25C3%25B3n+en+llamas'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 'https://cdn.shopify.com/s/files/1/0430/9372/1255/files/lavozedidozuv.pdf'. The ML classifier strongly indicates maliciousness. The document body, though partially garbled, contains references to these URLs, suggesting an attempt to lure users to 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.cc/wix?keyword=td+jakes+oraci%25C3%25B3n+en+llamas
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/lavozedidozuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/zidizozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/plant_classification_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/18617887020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/adobe_creator_mod_apk.pdf
    • https://static.usrfiles.com/ugd/9cb927_9172514902fa40dead0f718b54da5648.pdf
    • https://static.usrfiles.com/ugd/77941b_ce4ee0ee6f2945cbbfa6bb5d15edc80a.pdf
    • https://static.usrfiles.com/ugd/c162b3_d8c3332ab61d42e69331682e0b0f2d70.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a542d162a5945f3b757918502827c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_827273defede44d1b6180b8bfe373ef4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/86392115854.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/acca_financial_reporting_questions_and_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_0856dfd6b24147a297ed4a686f5d731d.pdf
    • https://static.usrfiles.com/ugd/d43733_19f5b89bc5ba4507a3ce388d368c3324.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_off0000636d.bin
a019ac069b500746c1a9ac4c2fde9ea7f0882596c1bd06f372c926dafa7a5fab
pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 5312 bytes
font_01_sfnt_off0000752b.bin
4f7cff8b30df44f7e01722551fdc66c17644d29b0eca2ee582e93ba12a7f03a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x752B 11192 bytes