Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa027cdb802da011…

MALICIOUS

PDF

50.9 KB Created: 2020-07-26 13:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4664eb9489ba7c2dcf1e2ec9e2343c9 SHA-1: 40f806a81692c22e8f62d06d9e41e0a1d5ce4ba6 SHA-256: fa027cdb802da011dc2bd24ce2098757925e49b260ef161f5dc3844262b5b2c5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to direct users to malicious content. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of multiple embedded links, many pointing to Shopify domains, further supports the link farm heuristic. The primary malicious IOC is the ttraff.com redirector.

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.com/pify?keyword=fraction+decimal+percentage+worksheet+gcse
    • http://files.robertlloydartny.com/uploads/1/3/1/4/131453365/974a8b07f.pdf
    • http://files.brandshamans.com/uploads/1/3/0/8/130814923/33575.pdf
    • http://files.maddensewer.net/uploads/1/3/1/4/131406108/pamuvukomaresal.pdf
    • http://files.colombotourpackages.com/uploads/1/3/0/8/130873708/xulizajelinif-zisuz-datesededezapof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/86530658231.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/36554971390.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/fabageragudanabapekev.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1742/files/67018312402.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/63524142259.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/43441029467.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/temisokaveve.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/galewuvaguroregizalowaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/24855364671.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/dofegaxoborizukoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/2218/7685/files/37369243622.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6151/files/78821664022.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_off00008813.bin
4c3efa3ba89d615f4025f802eaff3074f95e5a9d7af6e825a4ca682a132c77e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8813 5388 bytes
font_01_sfnt_off00009a43.bin
83d23fa24a4d738d6a13fb6c50b9dedccfaeda13b2ea722ed37eada1134e425f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A43 10656 bytes

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