Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9537a8a495b9c69…

MALICIOUS

PDF

51.0 KB Created: 2020-07-29 08:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e8658ea2e41220c92321cd498d148ee SHA-1: 2aca60687e0db16a1dcef4bdc194876d3625b5ec SHA-256: c9537a8a495b9c6938d4f1c2dddf5a9f42b199b1d68a5e4a42d1796703b3c5bf
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, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of these links, https://ttraff.cc/pify?keyword=ahri+guide+9.+15, is flagged as malicious by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of these link farms suggests an attempt to manipulate search results or redirect users to malicious content.

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/pify?keyword=ahri+guide+9.+15
    • http://files.redleaf-properties.com/uploads/1/3/1/1/131164159/b7227a0f6ed.pdf
    • http://files.rochonsandshall.com/uploads/1/3/1/4/131406735/kedibetewawevimesuke.pdf
    • http://files.craigsterritt.com/uploads/1/3/1/8/131871745/9afea4bd9e393.pdf
    • http://files.inhomministries.com/uploads/1/3/1/3/131384300/4abe1ce7.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/52943415818.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/pakavejel.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/77603359417.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/luzujowufovubesebebuliv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/67193045253.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/xuvokiwefibizimopili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/xifexorametomovojogewoso.pdf
    • https://cdn.shopify.com/s/files/1/0437/4141/3527/files/degamoxuluzewezujijijibug.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/
    • https://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d36.bin
398aae999168aa6ef49c8b3611d3efa9afc5484afa9098bba3f60fb4d0773cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D36 4608 bytes
font_01_sfnt_off00009cf5.bin
120ed1d8250c1d67f1ac321df3579d774e0803f358be9fd969fdb542276764e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF5 10048 bytes

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