Malicious PDF — malware analysis report

Static analysis result for SHA-256 9246b94eafdccdfa…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 17:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fcfb841e4191b9a2068a062f68babc SHA-1: c658137dc298479cceb24befc0b1d7bbb254f464 SHA-256: 9246b94eafdccdfa38e8ec7df759e48fcba60bef6f2df99d08067576ae571cf9
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a malicious URL disguised as a download for 'Tor browser free for windows 10'. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the redirection to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, suggesting a broader campaign to distribute malicious content. No scripts were extracted, but the document's structure and embedded links strongly indicate a phishing or redirection attack.

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=tor+browser+free++for+windows+10
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/bedukifesas.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/allergic_reaction_to_brand_new_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/21827063029.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/47818998058.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/ziviwakenupilofu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/sujozedosuropexosug.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4885/files/54599373630.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/lovoraniguzovaran.pdf
    • https://static.usrfiles.com/ugd/b8c837_116f9e7c5bb14586972edbc3ed1e0a6a.pdf
    • https://static.usrfiles.com/ugd/b4a829_6e5412aa15f541938f144cb9b6fd8b3b.pdf
    • https://static.usrfiles.com/ugd/c1108c_f93c5be4618a4b9f8b659fc5978d46f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_46727d6a9e3a44e880657e6f3428764c.pdf
    • https://static.usrfiles.com/ugd/b8c837_574b4fec45da492e8caa4cedde46f2f9.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_off00005cad.bin
e8591fde6489f8006f17be61fd2ad58d5e16014bdcfb0166775e802e2f92edd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 5036 bytes
font_01_sfnt_off00006df4.bin
3985f881c724c9c7e50a98a1ff4378358bcf7fcc85c319ecb7ae94760ab2d37d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 10216 bytes