Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82a3d39b4d364f2…

MALICIOUS

PDF

37.7 KB Created: 2020-08-15 04:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f81f14044e48595b2bd66cdc0b4eae1 SHA-1: 6177eefe3684a15aa65db23ec17b989ffaa3f554 SHA-256: c82a3d39b4d364f267d4052c5fe9e9b83ebae6eb6f39cc95be5bdee471fd02b6
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. This redirector is likely used to obscure the final destination, which could be a phishing page or a malware download. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The presence of a link farm further suggests an attempt to manipulate search engine results for malicious purposes.

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/wb?keyword=campbell%20biology%20test%20bank%20pdf%20free
    • http://lugipujef.studioprbozeman.com/uploads/1/3/1/4/131454165/tofiri_gukojosat_jupenazipisile.pdf
    • http://files.cdestinydesigns.com/uploads/1/3/1/3/131379948/7fd0ad71e18491.pdf
    • http://files.gswcs.com/uploads/1/3/2/3/132303205/dulinijurojidatuvi.pdf
    • http://files.hyperformancellc.com/uploads/1/3/2/6/132680967/vekakogutuz_xadasojogu.pdf
    • http://files.cwudaytonoh.org/uploads/1/3/1/8/131872298/pubabomarudiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72645751706.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/79887234476.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/vurokewigepikibalejej.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/62233844891.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/noughts_and_crosses_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/jodozalomoxobozujopus.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/xupifafiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/surujux.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/75947076653.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1284/files/varutilobib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83300066175.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/40707309032.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_off000052f6.bin
a2ebfb2bba8a4b085c2207357bb49c14d488477f5482b952d41bed7593a00f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52F6 5572 bytes
font_01_sfnt_off000065d0.bin
6b435c5b07fb34995931daef55c4cc0dedc25926e991d6d500ed42aa5ce4072f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 10568 bytes

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