Malicious PDF — malware analysis report

Static analysis result for SHA-256 88af22e0ee11c6ba…

MALICIOUS

PDF

45.2 KB Created: 2020-08-16 19:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fe12be357fce3fcff36dc54e046c7cb SHA-1: 9bc085c58d447a8412f7e91761b6e5088464db20 SHA-256: 88af22e0ee11c6ba6555b88d7a58b57ab68c22f700fa9e71e31c9b0e07f78c2f
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=consolidation+settlement+calculation+spreadsheet', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Consolidation settlement calculation spreadsheet' and also includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a 'PDF_SEO_LINK_FARM' heuristic further indicates a pattern of hosting numerous links, likely for SEO manipulation or to distribute malicious content. The file is generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=consolidation+settlement+calculation+spreadsheet
    • http://gixiko.zoetrodd.com/uploads/1/3/1/4/131409090/1700081.pdf
    • http://saviweki.rmarkillie.com/uploads/1/3/0/7/130775506/kaluvamixer_nojitedasigoso.pdf
    • http://files.missminnesota.org/uploads/1/3/2/6/132695258/paduluj_jozuwosolimivop.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/1999_jeep_grand_cherokee_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/atomic_number_table_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/mirimapabixabagab.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/10243149764.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/vadefudiwokepem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/python_import_module.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/noperelob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/brave_new_world_chapter_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5804/files/strlen_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5159/7480/files/tozosap.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/lujuruzunegewewowafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/employment_contract_malaysia.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_off00007303.bin
df70ecc3eaa4f100908365834531ebc598509856527391170f3e5fe7abc3cd2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 5220 bytes
font_01_sfnt_off00008490.bin
72d5ef3d2046b701041476f25b92f14026ebe37d36b186c6860dec9978977971
pdf-font-stream PDF embedded font (sfnt) at offset 0x8490 10136 bytes