Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4eeace7f02db56…

MALICIOUS

PDF

37.2 KB Created: 2020-08-31 06:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 149a92ac2f41fcd10af04c4809e4575a SHA-1: 6a4c544f7283ac3e50d783aa01fd778ca8c4bd83 SHA-256: 7c4eeace7f02db56f1124ada7e54b3764021c460fd60bcf208bc9dc7c84f4614
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for sheet music, likely to encourage clicks on the embedded links.

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=humoresque+string+quartet+sheet+music
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/xutitokakuvenukulod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4440/files/xuwesowovesapivuzigutotut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/jobitebamitabijop.pdf
    • https://static.usrfiles.com/ugd/de60da_a37c409ce6d943d89c79053dd281d3e9.pdf
    • https://static.usrfiles.com/ugd/e2f197_0fb58c50b19f47c8b3e199b86d096f58.pdf
    • https://static.usrfiles.com/ugd/b8c837_04c8d2ed750348cc964112c5802ceda1.pdf
    • https://static.usrfiles.com/ugd/8e1900_cd4b7f1cde87454ea65a7f9fb2d54d14.pdf
    • https://static.usrfiles.com/ugd/6d59ab_ab01f36b93734def81e2e65b3fa00279.pdf
    • https://static.usrfiles.com/ugd/0a51c1_059ae9730cbc448b80ab7c4402edf834.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/70346444346.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/diwomibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/77176729332.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_off00005403.bin
bb16fb1b52e9fa11aa91cf56c921f7bf2eb155ff36b80bb10f9e08f3b86c91de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5403 5268 bytes
font_01_sfnt_off000065b9.bin
ffef219b5510ae28acb542f4da92c872245f53d67da8e9f39b7617525f2f6a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B9 10164 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.