Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c35af78c37621e…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 21:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8825342b6fc1f10e0d287ccb6608150b SHA-1: 75808a11dc59b8d6450c8ec18e49ecd6f52b4d15 SHA-256: 82c35af78c37621e7cabfd576e5aa0d90c91e3837b8d2dc6fa45824f1f2398b4
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting a lure to a malicious site. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=bill+gaither+songs+free+download
    • https://static.usrfiles.com/ugd/b8c837_58d831476a6645cba70ad109b2a43909.pdf
    • https://static.usrfiles.com/ugd/a2e20a_67514a70fa334632b147dbd8c567501b.pdf
    • https://static.usrfiles.com/ugd/b8c837_84d57bfd287a4c5ab69d3ef4287faab9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a97b535424944388ee9c23b16124b08.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f6e0a5b89b14037a7c44b6d91043543.pdf
    • https://static.usrfiles.com/ugd/b91566_578e298486ba4ebcad0081459ca42982.pdf
    • https://static.usrfiles.com/ugd/b8c837_45aaa70368c748eabbcd910d550aa9b3.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/56189448888.pdf
    • https://cdn.shopify.com/s/files/1/0437/1569/0650/files/73933247181.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/19647198300.pdf
    • https://cdn.shopify.com/s/files/1/0457/3646/0444/files/alapana_christian_album_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/gopapedopawikawivetetege.pdf
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/nugena.pdf
    • https://cdn.shopify.com/s/files/1/0431/5332/6242/files/pegavirisizaw.pdf
    • https://cdn.shopify.com/s/files/1/0462/8309/6224/files/69691329371.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/danupud.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_off00005aab.bin
6886c2e8adfa46b0ca2f4cbc54638147c8b75c424ec98d424bc96b0f2181ac12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAB 5308 bytes
font_01_sfnt_off00006cc0.bin
20524c6df52d1a447d5b9087b461b59caf47859673a3b715ac2f53725c45c8fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC0 11472 bytes

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