Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b852620aecf0e21…

MALICIOUS

PDF

41.0 KB Created: 2020-08-01 13:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda39027b65fa9f4e70fd80697f31854 SHA-1: 0235290e3b35f62f76a160dca58a4805f87a9b35 SHA-256: 1b852620aecf0e21de3ba67478452f692196a767c5db34ae6d0f1d3d7278c659
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to Shopify domains, likely to improve SEO for malicious content. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/pify?keyword=pokemon+tower+defence+hacked. The document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. 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=pokemon+tower+defence+hacked
    • http://files.sjichamber.ca/uploads/1/3/2/3/132303151/8974582.pdf
    • http://files.thriveoctherapy.com/uploads/1/3/1/6/131636689/kigewesa_nuzapefibol.pdf
    • http://files.medfieldheightspto.com/uploads/1/3/1/0/131070190/joridesaz.pdf
    • http://files.engforu.com/uploads/1/3/0/7/130776883/f3338e25065.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/51874259747.pdf
    • https://cdn.shopify.com/s/files/1/0430/4198/0567/files/92491193461.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/sejezemokikegikunebo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2240/files/norufenunamogelotimezef.pdf
    • https://cdn.shopify.com/s/files/1/0434/9778/3458/files/43790520464.pdf
    • https://cdn.shopify.com/s/files/1/0436/1450/3075/files/jabaxumibuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/lemala.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/72976540515.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/kabiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/valid_email_address_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/muladosuxuzaloboponavugav.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/zifapel.pdf
    • https://cdn.shopify.com/s/files/1/0439/5171/8558/files/31144403126.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_off00006272.bin
f0cede5d587eee76b4b1fe40f70c62dda1a39255c28107181c40a6559f33da2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 5208 bytes
font_01_sfnt_off00007414.bin
6ecd0276b5536e518ad422ad22f0e7ba8c8257da23489b2793fc9d5407d6aaa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7414 10228 bytes

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