Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29854b02f430cfa…

MALICIOUS

PDF

36.2 KB Created: 2020-08-05 09:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72125993c26510192c60722986618dec SHA-1: cd174352b370cd1b0b2137d8cec5ca1ca21c69ca SHA-256: c29854b02f430cfa785a98613e3a8cbae91776ee6d1ad52e751484b08ef20ba6
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a PDF link to a known malicious redirector at https://ttraff.ru/wb?keyword=guitar%20pdf%20free%20download. The document body, though heavily obfuscated, contains text related to 'guitar pdf free download', suggesting a lure to entice users to click the malicious link.

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=guitar%20pdf%20free%20download
    • http://files.svaptsa.org/uploads/1/3/0/8/130813934/9e0edab563edc4d.pdf
    • http://files.icaisfo.org/uploads/1/3/1/4/131453124/mojofuv_kexina_xasaxaw.pdf
    • http://files.kelownaplumbingsolutions.com/uploads/1/3/1/3/131398156/vudejinu-kedav-benosagulita.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/99561152162.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/liwunojifireluwolixe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6702/2239/files/nenudeva.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/sitereber.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rinajimakonewob.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0374/files/bilod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9562/9725/files/89135514328.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/pofamisaxulijarixowovazuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/bsava_procedures_manual.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_off0000505e.bin
0b5fa3f2d1b09f920d62cda1121a5c4b57eaa3076e544e8ddb24bba967eaa80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505E 4980 bytes
font_01_sfnt_off00006177.bin
af0291f4340fe59e9659e9b12b010ae42ff2d6b3445b3b3f7aa1ef0078bba036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6177 10248 bytes

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