Malicious PDF — malware analysis report

Static analysis result for SHA-256 43db7886987e4eda…

MALICIOUS

PDF

45.3 KB Created: 2020-08-04 22:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c20e0fd2a9c3cb8de50534964a1bc6d1 SHA-1: 300c01d0c4774fa4279e732b30f3e100713bf149 SHA-256: 43db7886987e4edaf88d545d83e987218efa97a87d411bb0ab453230af6f72ab
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=amendments+worksheet+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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.ru/pify?keyword=amendments+worksheet+pdf
    • http://files.elementssalononline.com/uploads/1/3/1/6/131637316/50cb583733897b4.pdf
    • http://kulomis.sarahpatzphd.com/uploads/1/3/1/3/131383791/nojigegel.pdf
    • http://files.blend-boutique.com/uploads/1/3/1/0/131069863/verugirigupoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/zotuvalilitefetesubefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/74042019641.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/27755427728.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/38153880287.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/dodixokulowotogoli.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/96517221659.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/36694220690.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/lofixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/75675572028.pdf
    • https://cdn.shopify.com/s/files/1/0435/3107/5743/files/88460383196.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/apex_tv_manual.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_off000071b3.bin
3f4aca99c54e65a943bbb67afb0232f79d92bf681309e5625f3072e67c997cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B3 5184 bytes
font_01_sfnt_off0000833f.bin
2a9a997ee21fcef921338583a2865ed362abe03ea48cd84d83b6c6867e3f9fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833F 11264 bytes

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