Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc84d28b41c58e8…

MALICIOUS

PDF

48.3 KB Created: 2020-08-28 09:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8bd02861e028f7e159e08b83de0f05 SHA-1: 37093adfd5e690d698100e7c1ec2f48638d69ef8 SHA-256: edc84d28b41c58e8d864be0976c35fb175967d3e0ad4e3d2abf56e13e295d211
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used to redirect users to malicious sites. One critical heuristic firing specifically noted a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=5+savaiciu+nestumas'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on various domains, suggesting a link farm designed for SEO manipulation or to distribute malware. No scripts were extracted from this sample.

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=5+savaiciu+nestumas
    • http://files.but10nscreations.com/uploads/1/3/1/6/131636988/6869826.pdf
    • http://files.sixthscentsoils.com/uploads/1/3/1/4/131406827/a54711710.pdf
    • http://xidik.wheatgrasspublishing.com/uploads/1/3/2/6/132680981/e547940.pdf
    • http://maliv.biblerapsnation.com/uploads/1/3/1/6/131606968/jetaganesusasexa.pdf
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/xasaduziwipusado.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/74285367570.pdf
    • https://cdn.shopify.com/s/files/1/0463/3542/6721/files/31282846903.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6901/files/blood_lipid_profile.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/93971278972.pdf
    • https://cdn.shopify.com/s/files/1/0449/0782/3259/files/multiplication_worksheets_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/ecological_pyramid_pogil_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5004/files/61730746908.pdf
    • https://cdn.shopify.com/s/files/1/0432/7738/5892/files/49276689108.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/fuwogotonotagajameninunu.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_off00007d59.bin
78aecb25306ced00c4e4900231aae0aeaf30f9f3e9e03149f669f5032fb6fc97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D59 4904 bytes
font_01_sfnt_off00008df7.bin
7e5d99eb2ddd8f73bdaf81aa50734844d2840c38a6871c118e3d83a0b7dc0988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF7 11896 bytes

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