Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82696376a1ffa5f…

MALICIOUS

PDF

44.3 KB Created: 2020-08-11 14:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e0001b2584a8cf2c7ca7583002d413 SHA-1: 7d335015edb01559000a2e75a26c40dadfb29340 SHA-256: c82696376a1ffa5f3f4afa6ccb89c360b7a280182adc3b3c166a9d4a0648ed78
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'sepsis guidelines pdf' and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious content. The presence of many external links, including to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=sepsis+guidelines+pdf
    • http://geralut.cornerstonecowboychurch.org/uploads/1/3/0/7/130775432/gatizoleluzelivedu.pdf
    • http://tebitisep.slatingtonbaptist.org/uploads/1/3/1/8/131856158/lewamomuwima-xifemilesozul.pdf
    • http://files.teflvn.com/uploads/1/3/1/3/131379846/7c0786b.pdf
    • http://files.silvaweb.net/uploads/1/3/1/3/131380021/7795ffa7b2fd.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/42459641169.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/sinunumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5574/files/xagasedewa.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/basic_concepts_of_business_economics.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/gigibejewusixuletupejin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5603/7016/files/5115111328.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6751/files/alpine_mrv-_m500.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/fafekixum.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/encyclopedia_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/wirekizox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9137/8854/files/55349250584.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/93117093950.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_off00006d9c.bin
c30a76b17f4635c06ca813841612546ef0c382ecf6af017f7b2715abd11df68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9C 5008 bytes
font_01_sfnt_off00007eb9.bin
53776233cf5c57bb9794054d751c09f2f3b7738d24d5fa8582e7ec1503839f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB9 11784 bytes

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