Malicious PDF — malware analysis report

Static analysis result for SHA-256 878697c1181b737c…

MALICIOUS

PDF

47.3 KB Created: 2020-08-04 05:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50db8bd3db0a92087615a0b7a19622de SHA-1: d30bf6a26d446933053f2d5eda7630e8a9431aa5 SHA-256: 878697c1181b737c1c73a302f19ffcc9ec5e956d97c2420e389628e946b554b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.com/pify?keyword=minuet+in+g+major+bach+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, indicating an attempt to lure users to external content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=minuet+in+g+major+bach+pdf
    • http://files.ashleighlleiter.com/uploads/1/3/1/4/131483830/f399f410886.pdf
    • http://files.lknailsandbeauty.co.uk/uploads/1/3/2/6/132681938/wovaxale.pdf
    • http://files.rocnifinland.net/uploads/1/3/1/6/131637194/xalorexipijofum-kusotebeveb-xaxebozomexaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/6190/7351/files/pathophysiology_of_congestive_cardiac_failure.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/molowebokubepulu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/ratuwokegexukijupavori.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/27486352753.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/42670747724.pdf
    • https://cdn.shopify.com/s/files/1/0440/6326/0822/files/89905440013.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/sibulatajuviw.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/38594105331.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/23755897143.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/labulusinubolefapox.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5285/files/dotasalesasivuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/gezepovesegetu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ae9.bin
1abd963cbceeea89e7ba9f4ecb7e2a8d8c0e4bdd1e8c7aac21ba01215cbc29f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE9 5580 bytes
font_01_sfnt_off00008dc9.bin
c78c33277a1fcd0eb4a0c556611ae74af1f46c07cd23a10f0aaddf2fcdd3e8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC9 10280 bytes

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