Malicious PDF — malware analysis report

Static analysis result for SHA-256 25913019f8f40b35…

MALICIOUS

PDF

47.9 KB Created: 2020-08-29 22:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b907641b8ba31ff0a686d02f383ad5b5 SHA-1: 0a222781bb123c3882a9cb412615ffff0d64b5ac SHA-256: 25913019f8f40b35cf26260b279c1e1c32a0e2808110603cbc52f3287a261f31
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external resources. The primary URL, https://ttraff.ru/wix?keyword=2nd+grade+reading+passages+multiple+choice+questions, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking through to potentially harmful 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.ru/wix?keyword=2nd+grade+reading+passages+multiple+choice+questions
    • https://cdn.shopify.com/s/files/1/0446/2634/6147/files/social_security_tax_withholding_form_w-_4v.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/gipaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/samovuserifawelufewop.pdf
    • https://static.usrfiles.com/ugd/b8c837_6263b29036f743c0a76294c39c240abd.pdf
    • https://static.usrfiles.com/ugd/b8c837_3137da062c8b48e3b358b055b572269f.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_c8133dc9ad79437e8cee0a3f0cb99239.pdf
    • https://static.usrfiles.com/ugd/b8c837_d13b2cf7acd44bf5a61c0a29e2f928d2.pdf
    • https://cdn.shopify.com/s/files/1/0463/6419/7019/files/idsa_guidelines_treatment_of_tb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/chemistry_handwritten_notes_for_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/arya_samaj_marriage_application_form_hyderabad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/93393076220.pdf
    • https://cdn.shopify.com/s/files/1/0439/4126/5566/files/zovezizojelutexitabijax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007066.bin
5d0a03e0b71a476fb6f9c3706d032fcc6f30a0053af60172d49e3cdb280268d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7066 5532 bytes
font_01_sfnt_off000082f1.bin
4bbb91f9647e64855a4b302b0b1354556b4f5e2bcb59c2cc0cfd94b70ae02cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 9836 bytes
font_02_sfnt_off0000a47a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA47A 4324 bytes

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