Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b19b3e686c2f90…

MALICIOUS

PDF

71.0 KB Created: 2020-07-26 12:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b389f7ba691fa9bb9e65f9c1e1789f4c SHA-1: 82508f117a6ba7f8e0c5d5c72a3b5b8c020d4b2f SHA-256: 47b19b3e686c2f90471ac5c6541257fabbecf44b8f7928ad75350635e23930db
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a mass external PDF link farm. One of the links points to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the presence of the URL and the heuristics strongly suggest a link-farming or redirection attack.

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=chemistry+challenge+problems+balancing+chemical+equations+answers
    • http://files.optimumstagesoflearning.org/uploads/1/3/2/3/132303315/zofib_zufolunazoketuk.pdf
    • http://files.modernbarandhome.store/uploads/1/3/0/9/130969706/nikurilidexubavejema.pdf
    • http://files.blackpositiveconcepts.com/uploads/1/3/2/6/132696030/d2b3af.pdf
    • http://files.simplymagicaljewelry.com/uploads/1/3/1/4/131483371/4ec52afe259a00.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3061/files/vawakitufogan.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/82917814274.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/26979575704.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/wukokonukaxajojasale.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/71601963605.pdf
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/75726309665.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/45464508227.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/48885223963.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/83064311263.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_off0000d63a.bin
0800f2bf054f4a595eace012eacc145e89d1233d3baaff3e7ff8a5f3ead0efcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 5712 bytes
font_01_sfnt_off0000e98b.bin
c594ce966b18da458c3f743ccf12c7cffc67f774b8c3198ed15f4f33bff6ca31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10756 bytes

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