Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9b7e3bbf99d5c2…

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 11:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49c515f1bd97c64668d0eb7b6959a73 SHA-1: bd9402d18e98b522714ddc6948e01532ffdb1cff SHA-256: 8b9b7e3bbf99d5c265571336eaa19cb6fbf6667c20e01475d953e0908ec95b27
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify-hosted PDFs, suggesting a coordinated effort to distribute content or lure users. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text but includes the malicious URL and several benign-looking PDF links, reinforcing the attack pattern of redirecting users to potentially harmful 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=directorio+de+grupos+de+alcoholicos
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/vivikot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/76973660746.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/18120823728.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ac644d0e1a149d2abea4b0a4a9dd6de.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeeec7059f2c46c69f5ad0e5a6696a2e.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/52564335436.pdf
    • https://cdn.shopify.com/s/files/1/0438/1373/2512/files/cable_length_voltage_drop_calculation_formula.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/62652511208.pdf
    • https://cdn.shopify.com/s/files/1/0439/2108/0475/files/eicar_test.pdf
    • https://static.usrfiles.com/ugd/b8c837_3de774401a19459cab34877a8135017a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae6b6a3abb8f4e8797b7cd5b917673a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_709bbebb40af484b85921a52210b3de5.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_off000055d3.bin
7ba27db7b0221997f88bd993451706478b1dfaf2adfbfa6ca1a34af047489817
pdf-font-stream PDF embedded font (sfnt) at offset 0x55D3 5332 bytes
font_01_sfnt_off000067e7.bin
c3400fb06efb1c9591fbc1efd163cf28604d22fc658338fbe176914047a5dffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E7 11340 bytes