Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5efad0c070cdc80…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 02:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 541b9094d7d9e1bdc0a0159cb0a56019 SHA-1: f48a1a34bf297f75628c49ca2332613c05e3a67e SHA-256: e5efad0c070cdc8053f12b7155d319d0d952252f30ba27f7174b8564adde3192
128 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to lead users to potentially harmful external sites. The 'SE_INVOICE_LURE' heuristic further suggests a social engineering tactic using fake invoice content to encourage clicks. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

Heuristics 4

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=open+office+invoice+template+simple
    • http://sedofutum.kurtlsylvan.com/uploads/1/3/0/7/130739366/7035904.pdf
    • http://ludutipov.yanka-online.com/uploads/1/3/1/3/131397997/cb249e46c070.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/48472903146.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/51168491671.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7268/files/50386601114.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/paragraph_transition_words_for_essays.pdf
    • https://cdn.shopify.com/s/files/1/0435/5466/8705/files/children_s_mathematics_cognitively_guided_instruction.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/vanirezukodadelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/xabuzajegabatetewapawa.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_off00006635.bin
f9532ce8217b09f0fe550716a47d0421676ff77cc010e986296609dc4a87c36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 5152 bytes
font_01_sfnt_off000077b2.bin
76f68fa78da82884d72a6d731d5b9ca3f0ff9cdaf072457e0915c0d941f1dc79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 10296 bytes

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