Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a796343b1f62b9…

MALICIOUS

PDF

45.2 KB Created: 2020-08-31 17:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c2621a6979dcb455e59495f3a8bcb21 SHA-1: a98f65a253e5be47029e07a112816d8cf36575ba SHA-256: 91a796343b1f62b9f181b9fedabb11f905d3bde3050fa8d7adb738193c8c60b1
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a keto diet recipe PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the embedded URL, https://ttraff.cc/wix?keyword=keto+reset+diet+recipes+pdf, leads to malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, many pointing to benign-looking PDFs hosted on static.usrfiles.com, likely as a distraction or to inflate SEO. The document body, though heavily obfuscated, contains the lure text and the malicious URL.

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.cc/wix?keyword=keto+reset+diet+recipes+pdf
    • https://static.usrfiles.com/ugd/45e30f_52da16be8c4546a0b66f10fb6f3ef595.pdf
    • https://static.usrfiles.com/ugd/de65f7_0267ca36cbdf41ffa175a4168ffb81c5.pdf
    • https://static.usrfiles.com/ugd/1f6d71_109fb562ea0846ae9f3f2403323771ce.pdf
    • https://static.usrfiles.com/ugd/e3834b_a925686c432848cab61f8a8c169835eb.pdf
    • https://cdn.shopify.com/s/files/1/0440/0542/5310/files/linking_stylesheet_to_html.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/tazuzixezevuvenoxiwazuwuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/kopojirinonanapirezal.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/74480212492.pdf
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/rugabeginuvogekumaju.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8364/files/xefunavixupaxepemufate.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7b4058e02c947d09a2cf0f90eecc184.pdf
    • https://static.usrfiles.com/ugd/b4609a_7509e00fdb6d41fabfc9894c0394d68f.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_off00007418.bin
4009b1b501c554a2ecc528ea18ba6573271af8edb9768a014cb25deb3f87faa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7418 4876 bytes
font_01_sfnt_off000084c9.bin
9a48cc8f9e35c11983c39202c1e46162139e5e859fef488250cdbe71e9a773ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 10352 bytes

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