Malicious PDF — malware analysis report

Static analysis result for SHA-256 356ef43f9b4bc162…

MALICIOUS

PDF

42.3 KB Created: 2020-08-01 20:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b515d00706bafb5078da1ec3c4dc4f71 SHA-1: ef74498c9d341fe9bee0f89627a055c86605a5b9 SHA-256: 356ef43f9b4bc162c42082a4fd3c601df45997bc744ccde0f08a86b34649461e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.cc/pify?keyword=weather+channel+95531'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates an attempt to create a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=weather+channel+95531
    • http://files.qualitytutoringservices.com/uploads/1/3/1/3/131380308/mopozexasepugatusag.pdf
    • http://files.cockburnarchitecture.co.uk/uploads/1/3/1/8/131856195/kukuvadumonododoso.pdf
    • http://files.arnoldroad.org/uploads/1/3/1/6/131636682/ca56fd6.pdf
    • http://files.straymongrel.com/uploads/1/3/1/8/131871894/4cc60b638a0f8e.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/beyonce_lemonade_download_mp3_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/9925161665.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/felugorawazakabonepoze.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/suvivivel.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/coleman_powermate_6250_generator.pdf
    • https://cdn.shopify.com/s/files/1/0430/8867/4967/files/20734736404.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/66669268650.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/36452153776.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/81093832605.pdf
    • https://cdn.shopify.com/s/files/1/0434/7530/4612/files/tekupage.pdf
    • https://cdn.shopify.com/s/files/1/0429/3695/9139/files/jugisowogetib.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1810/files/busimukokod.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_off00005e41.bin
18e858dd855bc0fcc75d8b325ae95e8053c9379ed7353f1d728c4139908fdb5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E41 5216 bytes
font_01_sfnt_off00007013.bin
59b75d56e1064838a03b2df47f4246e9db0823c234a01eb981959f28a27dcb7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7013 14112 bytes