Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c6bcac673c1a9c…

MALICIOUS

PDF

42.3 KB Created: 2020-08-31 09:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13111593b3f388835f5ffe66e2fd1ede SHA-1: faca82425359592fb9f5d2238575c7e56b738655 SHA-256: c7c6bcac673c1a9cb2ce630f2f575f86ee090076aec0268ed143d8ad233050ea
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.com/wix?keyword=virtual+assistant+proposal+sample+pd', points to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated but appears to contain references to the malicious URL and other PDF files hosted on Shopify. This suggests a campaign to distribute malicious content or manipulate SEO.

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=virtual+assistant+proposal+sample+pd
    • https://cdn.shopify.com/s/files/1/0434/1779/6770/files/fewebajumupomevolu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0912/1184/files/57734781637.pdf
    • https://cdn.shopify.com/s/files/1/0438/2942/8384/files/aashiqui_3_songs_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/gadak.pdf
    • https://static.usrfiles.com/ugd/45e30f_2ec881f1676e415a8ab34aede1b89dfb.pdf
    • https://static.usrfiles.com/ugd/48d9a1_214549fb738b429db293b70c23b64f4f.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_d5acae17fa314d9b927efabb7631c2af.pdf
    • https://static.usrfiles.com/ugd/735189_44aa7f38ca5f4761b2c79e91681ca776.pdf
    • https://static.usrfiles.com/ugd/b5aed9_f0c6b47530894b3baadd292b418bcfd5.pdf
    • https://static.usrfiles.com/ugd/429b25_768e5e72ecdb4e258108c666c6b47fca.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/4256081942.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0528/files/67314285110.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/alter_ego_a1_manuel.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/gixadazimufojij.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/
    • https://static.usrfiles.com/ugd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006734.bin
3164275d5da187e004d8abcb16403e542f306226b50232c7fe5fe19e51116dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6734 5068 bytes
font_01_sfnt_off00007858.bin
64a22e6eef64f910264fcbd689ee197bc939800dcf33ec70a7b8c6f37a78ee8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 10460 bytes