Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc67495d5a4c30b9…

MALICIOUS

PDF

40.4 KB Created: 2020-08-27 17:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab003e07e077912e9c052704b2c2c2d3 SHA-1: 1bc86a640326dd0bc53e8dbcd3440447f0c0c187 SHA-256: fc67495d5a4c30b91d5313df57b2c4375366fa7423ef04dad1eeffc61872d483
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting an SEO manipulation or link farm tactic. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=stardew+large+milk'. While no scripts were extracted, the sheer volume of embedded links and the critical heuristic firings strongly indicate a malicious intent, likely to redirect users to harmful content or exploit SEO vulnerabilities. The ML classifier also provided a very high confidence score for maliciousness.

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/pify?keyword=stardew+large+milk
    • http://vawiju.sfafs.org/uploads/1/3/2/6/132680813/506828.pdf
    • http://futifetiw.workwearnorway.com/uploads/1/3/2/3/132303382/segaxodil.pdf
    • http://gigiviv.keepitrealministriesd.org/uploads/1/3/2/7/132740214/440da1f.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/26684865818.pdf
    • https://cdn.shopify.com/s/files/1/0436/7459/9574/files/risibivazemetijajirajar.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9897/files/apartment_owners_association_rules_and_regulations.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2469/files/sort_an_arraylist_java.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/mutol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/73768008655.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/65748290730.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_off00006203.bin
aa938a050eb7003499713d0a1b38c8727c54e816bee0165b76978baf24946624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6203 5228 bytes
font_01_sfnt_off000073c2.bin
3f03fd7b0332e7676004ce2cc67cf42225e81e879cf500add6173d158b67467a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C2 9908 bytes

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