Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8fca06c03ebbf4…

MALICIOUS

PDF

47.4 KB Created: 2020-07-26 22:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b785f04f9067232b65a9312ddda26fd0 SHA-1: 74545f1d930b70aad3a9a3f74bbc3b6828ea5513 SHA-256: af8fca06c03ebbf4f337cde35aa47a13506fbb1e0669db8e8916fb091650c1cb
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to a known malicious redirector. Additionally, PDF_SEO_LINK_FARM indicates a large number of external PDF links, with the primary one being a Shopify URL. The ML classifier also strongly flagged this PDF as malicious. The embedded URL and the link farm suggest a phishing or redirection attack aimed at users seeking business formation documents.

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=delaware+business+formation+documents
    • http://files.arctictreasures.shop/uploads/1/3/0/7/130776110/geweduvukezefipipigo.pdf
    • http://files.paaap.org/uploads/1/3/1/4/131438113/sapibex.pdf
    • http://files.kickitlivingweekly.com/uploads/1/3/0/8/130873715/kenupa.pdf
    • http://files.kernellee2kettlecorn.com/uploads/1/3/1/8/131872032/posezivukigup.pdf
    • http://files.teammissionsports.com/uploads/1/3/0/8/130873830/56fd778fc49d11.pdf
    • https://cdn.shopify.com/s/files/1/0434/5554/5497/files/rorunevud.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/natekifakixuboboj.pdf
    • https://cdn.shopify.com/s/files/1/0438/5092/4182/files/xidajitoximegepegojor.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/migirumugufif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/vadimejutafatevowegez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/papixusisijipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/baborezudubisonisikowulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/gapewefazupap.pdf
    • https://cdn.shopify.com/s/files/1/0428/7833/7187/files/10050126742.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/65804427739.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.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_off00007a2c.bin
9b05739b303d4c87b24a25b573f8db2f07590ae084d4133b111c448c0acf19e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 5280 bytes
font_01_sfnt_off00008c13.bin
ddacc09d6462266f1da47364a0746f3dbd24bc835c3872d5a01f805a25721fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C13 10496 bytes

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