Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dd6f44a2d5f334…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 09:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c6c8aacb005411d53b406c4093e9ad SHA-1: 9fb906e05a6d34f8cb958135b0c6cb61a8abb810 SHA-256: d8dd6f44a2d5f334d3273deea300c227d1d6d401f893cfc4a31e16bb6a843846
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.ru/wix?keyword=appliquer+r%2525C3%2525A9glage+sur+un+seul+calque+photoshop'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to Photoshop tutorials. The ML classifier also strongly indicated maliciousness.

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=appliquer+r%2525C3%2525A9glage+sur+un+seul+calque+photoshop
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/lazarillo_de_tormes_preguntas_y_resp.pdf
    • https://cdn.shopify.com/s/files/1/0428/6896/5532/files/kapimori.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/vomoniwuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/gatekababukutiba.pdf
    • https://cdn.shopify.com/s/files/1/0460/0653/4303/files/regilepakegajotatu.pdf
    • https://static.usrfiles.com/ugd/b52961_bbf30a18839646db80cf3e4847a52ab9.pdf
    • https://static.usrfiles.com/ugd/9e53d4_4fae5eae909a43179ea0df550678811f.pdf
    • https://static.usrfiles.com/ugd/de02f3_1336c89d263748768c0353110c6e43b4.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/13436282741.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/sokokanon.pdf
    • https://static.usrfiles.com/ugd/253000_fa124d8159e64e5aaa8273c386ece02d.pdf
    • https://static.usrfiles.com/ugd/3826db_56558d1f01e2430282296b9e895f501b.pdf
    • https://static.usrfiles.com/ugd/78c764_653b6c0e72ed4500bb8d8790e8a16659.pdf
    • https://static.usrfiles.com/ugd/b8c837_65107c90225148b7ab58151f91e311ad.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_off00006f09.bin
f589de9cac25fd7a2b3665b9ac3ebe79935e4fc24186bbfa2ebbe81aa4b47242
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F09 5452 bytes
font_01_sfnt_off0000813c.bin
6e17cd1cdfb6c403e68429dfe5cabba1f0be061546407430d53405b99137358b
pdf-font-stream PDF embedded font (sfnt) at offset 0x813C 11900 bytes