Malicious PDF — malware analysis report

Static analysis result for SHA-256 7086ca48b245ab4c…

MALICIOUS

PDF

36.7 KB Created: 2020-08-13 08:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3c26ff567ab3a9306e3737ad9c5d32 SHA-1: 1cede9cc1c0371d8f5358a1c502b8b5960b44b45 SHA-256: 7086ca48b245ab4cacc2dc36400147463a802ad00d2d3937978587f3e3d63f88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with the primary URL identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to 'html to pdf converter' and the tool 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links further indicates a link farm or redirection scheme.

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/pify?keyword=html+to+pdf+converter+outsystems
    • http://files.thebambooretreat.com/uploads/1/3/1/4/131455283/967c71fc9b.pdf
    • http://files.hhsmusicboosters.com/uploads/1/3/1/3/131398338/30bd3d7bb5d1f13.pdf
    • http://files.sweetiescateringnc.com/uploads/1/3/2/7/132710624/gedilavigitakebijara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5181/8918/files/wavakoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/29353300012.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/srs_document_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/37625350913.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/fapotemiwapukepawu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8890/files/weludapiragudatato.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/nawebume.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/98290854470.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47948794002.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/68126038308.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/xowejefopuve.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005184.bin
945d72ea61099efffbe12256c933ff8a2278a81906575505b1c7573e2804b2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5184 5216 bytes
font_01_sfnt_off00006338.bin
0d29867455e56b6c06fb64a2636f11f3a785a01e10f80937383505349b5d4695
pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 10664 bytes