Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a742cbb1cfc6324…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 05:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b8eaaa30cdfbaf905976fc75fbd327e SHA-1: f29c416a4048f5685fa7a3419e567d33cfb7fee7 SHA-256: 2a742cbb1cfc63240ae1a4b8fa040510c9485541806b148f2b008e25b0859f48
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to Shopify domains and one primary malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains text related to 'understanding business pdf nickels' and the tool 'wkhtmltopdf', suggesting a lure to a business-related document that redirects to malicious infrastructure. 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.cc/pify?keyword=understanding+business+pdf+nickels
    • http://files.gabrielsartkids.com/uploads/1/3/1/3/131379290/1638655.pdf
    • http://files.mckenziefarm.com/uploads/1/3/1/4/131410952/6016068.pdf
    • http://tiporamum.codenamepandey.com/uploads/1/3/1/4/131483281/rarewuxef.pdf
    • http://files.boldedscience.com/uploads/1/3/0/8/130814534/wipufonadepifot.pdf
    • http://files.christchurchdartmouth.com/uploads/1/3/1/4/131438323/mixabonufovopopunez.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/mejeboni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/beethoven_piano_sonata_31.pdf
    • https://cdn.shopify.com/s/files/1/0437/7745/8334/files/atmospheric_refraction_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/9523/5490/files/46646318169.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6430/files/86982093558.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/bifuzov.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/86084321017.pdf
    • https://cdn.shopify.com/s/files/1/0440/6840/5413/files/43557361208.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/wijisomipekak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/fuwagitavukexun.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_off000061bb.bin
a37386b5842743cac17c11562961b07ae6e26664bfd1742bcd932cc31fd76be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB 5516 bytes
font_01_sfnt_off00007492.bin
51f1e3888b8e6cb494ff1f769372b62cfcf700926f681461ed5fa318fe3f852d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7492 12040 bytes

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