Malicious PDF — malware analysis report

Static analysis result for SHA-256 f184c71470e4cc3b…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 15:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c47879accaf9ce61af422e42afb920b SHA-1: 7f1cbb7b9c72f22c7eac5d5c295fa7d270fcca71 SHA-256: f184c71470e4cc3bca4bfb03118fbbad92100a8df4a19734f32856e12d5f1899
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The presence of a large number of external PDF links, many pointing to the same domain, further supports the malicious intent, likely for SEO manipulation or traffic redirection.

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.ru/wix?keyword=marketing+agency+company+profile+pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a53d74d6314b2a846eda4372a4e479.pdf
    • https://static.usrfiles.com/ugd/daca0d_dc868061b60944009097cccf5212995d.pdf
    • https://static.usrfiles.com/ugd/ace02d_5ae2a07e5b064e72bac830bf7a3ae3e8.pdf
    • https://static.usrfiles.com/ugd/b5472a_b237f402106945698ecf57c36a53f0fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a1a1ea9071436fa46061a6bd567d35.pdf
    • https://static.usrfiles.com/ugd/16a96a_1166f5236d2e4f43b0288d50bec5a5af.pdf
    • https://static.usrfiles.com/ugd/97aff7_ffaf90c946a94e2f8fed30b29bc99a4b.pdf
    • https://static.usrfiles.com/ugd/72b0e7_49507536e1fb43c8bc8729a9530e53ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_17b5f2711fc1485a82590df0ac64dc8c.pdf
    • https://static.usrfiles.com/ugd/ace02d_66ee35f00deb4533a9dd36f08325b240.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3097a67bfb0494a9ef8706d1a713206.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/axa_ppp_international_healthcare_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/68964609703.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/dr_house_temporada_6.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_off000062f0.bin
003c52dd8acea9c34f48f944aaab426a27dcee594d3c5ef2e9c752f83b681cdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 5468 bytes
font_01_sfnt_off00007595.bin
f51e3bcb99538ae531e367e8e9728f83caa3ee20438c1c0aaf68b75cafc66ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7595 10340 bytes