Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52ff66eef89a564…

MALICIOUS

PDF

41.9 KB Created: 2020-08-28 22:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 080cf6be4cc1f02dd30658d849bcb347 SHA-1: 7b16479fc90cc518e594e208b3af543b89458df0 SHA-256: f52ff66eef89a564ea1ca9b2dece2c569ac5685d5a2ce1bee9088bf9dea9adcf
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, disguised as a link to an ebook. This indicates a phishing or malware distribution attempt. The PDF also contains a large number of external links, many pointing to seemingly benign PDF files, suggesting a link farm or SEO poisoning tactic to obscure the malicious redirector. No scripts were extracted from this sample.

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.com/wix?keyword=principles+of+managerial+finance+15th+edition+ebook
    • https://static.usrfiles.com/ugd/b8c837_019a09f021114217a5f58feee6ad44b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d2526c93cb496e9193eaea4a828be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a811c98b19fb400c9221fc933725b746.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e091a9e74441d1ab7d59b58a3b6bc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f53ec0b69594ddd80c7ee7099861fe4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0564db30819642d980ce7fa014338bad.pdf
    • https://cdn.shopify.com/s/files/1/0435/6787/4207/files/assembly_of_god_doctrine.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/demographic_dividend_in_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/3275742785.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/vofoxupug.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/65834330463.pdf
    • https://cdn.shopify.com/s/files/1/0440/7505/7302/files/asymmetric_information_definition_economics.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_off0000627b.bin
b29b12c4d4085a71adc5569ac130a230aee5b96bf015c50073882bc342bb7138
pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 5948 bytes
font_01_sfnt_off0000768b.bin
f242b631326bcdd82954d1fadaaf1af43e2d266ed016f768083438cf2a531400
pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 10888 bytes