Malicious PDF — malware analysis report

Static analysis result for SHA-256 a471e2717751073d…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003417ceb7db4c733461425f4815156d SHA-1: 9700233cbcf0049b7673bdb17c96f3e8c98c5e06 SHA-256: a471e2717751073dac42829b635adbd4e16f0597772b1d97700cb8a4dedfba03
150 Risk Score

Malware Insights

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

The PDF contains a lure related to an 'IRS nol carryover worksheet' and embeds numerous links. One of these links, 'https://ttraff.com/pify?keyword=irs+nol+carryover+worksheet', is identified as a malicious redirector. The presence of a large number of SEO-optimized PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or improve search engine ranking for malicious sites. The ML classifier also flagged this PDF with high confidence.

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=irs+nol+carryover+worksheet
    • http://files.neurotherapycenterva.com/uploads/1/3/0/9/130969489/2204564.pdf
    • http://files.lifetrendgroup.com/uploads/1/3/2/7/132740682/tegividuraxoxe.pdf
    • http://files.offthegrid24.com/uploads/1/3/0/8/130814769/92f8c607d1f014.pdf
    • http://files.laucandrique-en.com/uploads/1/3/1/6/131606619/9202608.pdf
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/xipisotalema.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/56135748443.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/all_abbreviation_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/tijefolanasemefutixuxav.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/21258956037.pdf
    • https://cdn.shopify.com/s/files/1/0438/1779/5741/files/furolironuka.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/5478075601.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7911/files/60308756937.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/84339996459.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/xifilupulusijumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1086/6851/files/65445993814.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95610310087.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_off00006ac1.bin
737d9354166841a01f8afcc5d78c58b91417614db088d794f4bd1d18fddc9b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 5144 bytes
font_01_sfnt_off00007c50.bin
7e08eb47d5add4d6d16745379f225700f015503418434f19bc92add578eb6b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C50 10660 bytes

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