Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ea82a719c89b5f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 14:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be82467954abc8d7d4c14607574450f2 SHA-1: f6e1594d87cca37d6ea086d631c28283f90be1ff SHA-256: a4ea82a719c89b5fbbf50a104957591df3bb8dda8c62b0d6c77243845357fea5
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, many pointing to Shopify domains, but one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. This suggests a link farm or redirection attack designed to lead users to malicious content.

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.cc/pify?keyword=case+interview+secrets+online+pdf
    • http://files.annastark.com.au/uploads/1/3/1/8/131856131/040143ad.pdf
    • http://files.bluelabelconsulting.com/uploads/1/3/1/1/131164273/mepivonozesigu.pdf
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3436/1508/files/32254264731.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/davogepekuletox.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/34717690618.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3198/files/63085917094.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/transistor_amplifier_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/bafimowojetononujiga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/breathing_exercises_to_strengthen_lungs.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/72636776952.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/mojisabatum.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/cambridge_international_dictionary_of_english_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/bowopozuxeniwanabapim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/pukexasiwaki.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_off000069fd.bin
474f2c74d8898c2a4533f073e630fb6c63f8c10313ab44316b1ff4a504d77905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FD 5204 bytes
font_01_sfnt_off00007bd6.bin
7a1c3d33c3e6df4e6735a39c7578359fa412e4d94281e9fb3e23c537911fd3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 10420 bytes

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