Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d2fc2e8f32d1c7…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 10:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ac2dc40ce5b56a792a1c2e9b784c0a SHA-1: 3d3c8ea9b9daad0eb245ae862dd05cd5bcda2ac6 SHA-256: 11d2fc2e8f32d1c702cd2e41fe05911153da8fa2a73b542f35f4fce026c9eb80
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=phonics+worksheets+pdf+grade+5'. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'phonics worksheets pdf grade 5' and the authoring application 'wkhtmltopdf', suggesting a lure for educational materials that redirects to malicious sites.

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=phonics+worksheets+pdf+grade+5
    • http://files.newimage.net.au/uploads/1/3/1/4/131437987/234063.pdf
    • http://files.nerdendo.com/uploads/1/3/1/8/131857421/wepidugalenuxalutox.pdf
    • http://virurubuk.colorbrushcanvas.com/uploads/1/3/1/8/131857631/99f55.pdf
    • http://files.kristinrmt.ca/uploads/1/3/1/6/131606069/lubutemafoxeso_xabox_bejukufe_basanekuzov.pdf
    • http://files.restaurantrealtytx.com/uploads/1/3/1/4/131406506/1a77f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/74225520471.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/canon_rebel_xsi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/adobe_reader_converter_free_download_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0429/2644/0607/files/zotumewefokexutakife.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/34106210640.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/rakuvuwilelo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/siziwanevuwofave.pdf
    • https://cdn.shopify.com/s/files/1/0434/5492/2902/files/gedisej.pdf
    • https://cdn.shopify.com/s/files/1/0436/0051/1138/files/remuvukusanapixi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/98053899773.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/24703665267.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_off00005f9f.bin
97d0a989369def6a35333cc02d6f7aeb21f57cf65bd0be7994f8aeb6f037db93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 5668 bytes
font_01_sfnt_off000072fd.bin
ec9bf2ea39a50fd46639de17b31adfe68c626f10a5b4b33b74da8e051440b576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10360 bytes

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