PDF malware analysis — malicious · 40c9cb559cc2e238

MALICIOUS

PDF

31.7 KB Created: 2020-08-31 08:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b7b7ae4449eb371e241e6543b908f720 SHA-1: 6088a883700b6cd7689745d0d42d6f7b5fff6c2b SHA-256: 40c9cb559cc2e238a95318002f7e568aa75af22266c0014cd25877cc85a3b85f

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=brain+teasers+ppt'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to various PDF files hosted on Shopify. The document body, though heavily obfuscated, contains references to 'brain teasers ppt' and the malicious redirector URL, suggesting a lure to trick users into clicking malicious links. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=brain+teasers+ppt
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipipopiluniwewikojidil.pdf
- https://cdn.shopify.com/s/files/1/0454/5295/1702/files/cambridge_english_pet_exam_format.pdf
- https://cdn.shopify.com/s/files/1/0438/0445/9170/files/bisejifepajusedozip.pdf
- https://cdn.shopify.com/s/files/1/0431/1928/0288/files/japanese_economic_development_theory_and_practice.pdf
- https://cdn.shopify.com/s/files/1/0437/1592/0024/files/bangalakshmi_torsha_lottery_result_today_4pm.pdf
- https://static.usrfiles.com/ugd/fb5067_92a1990224ec4f498ae1c7261631af92.pdf
- https://static.usrfiles.com/ugd/26481d_1016be55ba9145faa50653209e18f30e.pdf
- https://static.usrfiles.com/ugd/44b221_925056e850b8499bb087800dac2b067f.pdf
- https://static.usrfiles.com/ugd/429b25_14a590844266467b8960aaff92e2bb07.pdf
- https://cdn.shopify.com/s/files/1/0440/9724/1240/files/11441443972.pdf
- https://cdn.shopify.com/s/files/1/0431/1964/0738/files/82831919458.pdf
- https://cdn.shopify.com/s/files/1/0429/9830/0823/files/coleman_air_compressor.pdf
- https://cdn.shopify.com/s/files/1/0428/9619/5737/files/45594778741.pdf
- https://cdn.shopify.com/s/files/1/0432/1483/1780/files/jedamokibolisafimu.pdf
- https://cdn.shopify.com/s/files/1/0432/5667/6507/files/loan_payment_plan_template_excel.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000435a.bin` `e1b6bc7b527340789d684769a5a99fbeef048097f344cd7497fd21b509fed278`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x435A	4832 bytes
`font_01_sfnt_off000053cd.bin` `d68e4fe36ecfbd342cc05f74be48c38495b37c92c1046aa2a3345947d7010e77`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53CD	8864 bytes

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