Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8844636532bcb23…

MALICIOUS

PDF

53.1 KB Created: 2020-08-30 22:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fd57abf8f1c44bc9fa72a93bf8ff60f SHA-1: d4c55e599f79d779c06913bd85fcdff1115b0197 SHA-256: c8844636532bcb234418783c73dcb7cabf90318f9aa3ab458dd0c0d21c73253d
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'certificate pdf'. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. The primary malicious IOC is the redirector 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.ru/wix?keyword=sere+100+certificate+pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/detugamajelafuxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/79872894341.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/69366446188.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4214/files/rebanasajerutukukulefut.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/vocational_skills_development.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/fejedelojob.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8236/files/steffi_graf_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0445/6900/2143/files/knowing_god_packer.pdf
    • https://cdn.shopify.com/s/files/1/0428/7869/7631/files/manirifedosetafiziteruwex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/4562129403.pdf
    • https://cdn.shopify.com/s/files/1/0439/1976/9755/files/pisopetorujerotunedubopuf.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_off0000913e.bin
3cb8670c2d7f7bed7255ac09b61f0ffef4bb6d39f65d8d0447d21e6ceb319877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913E 5236 bytes
font_01_sfnt_off0000a31b.bin
88d942853ba1b5b1d7635922a179ab2b2fa4df6f94af7cc2ccd4accc40ab5512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA31B 10668 bytes

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