Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bb5de6823f1cec…

MALICIOUS

PDF

41.8 KB Created: 2020-08-22 03:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5983d7b95983bcfb92f8c97bf9e4da50 SHA-1: 09a7c78ba0db97f8237e761c0f43464b60fcabb7 SHA-256: 35bb5de6823f1cecfc779d4bcd0b8ac5748a8ed47046bc207ee581ba5254c80c
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links directs to a known malicious redirector at 'ttraff.ru', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'top paid apps android' and the malicious URL, suggesting a lure to entice users to click on the malicious link.

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=top+paid+apps+android
    • http://xafile.doublehappinessllc.com/uploads/1/3/1/4/131437318/voreg_pelemoradesimuf_xiwuten_venagudij.pdf
    • http://kinifa.atec-amt.org/uploads/1/3/0/9/130969423/1401965.pdf
    • https://cdn.shopify.com/s/files/1/0429/9309/0714/files/lefifivozinevavitigefow.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/norikanaxus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/trends_shaping_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/lofevoxolekigumasadiga.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/denukudovujaburamiwawonus.pdf
    • https://cdn.shopify.com/s/files/1/0438/0341/0593/files/japarozizizilosu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/75879834281.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7920/files/causes_of_youth_unemployment_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/newsletter_samples.pdf
    • https://cdn.shopify.com/s/files/1/0434/2582/4929/files/no_man_s_sky_nitrogen_salt.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/wukase.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_off0000672a.bin
03fa8dd113aadc5979cc3bfecd96405e1e7a610e3a6cfd9578b9728c1d03b8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 4868 bytes
font_01_sfnt_off000077b9.bin
a640f4635000680d8857e8421ad26c057a68d0a4c0bb30872843d4aadacedb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B9 10156 bytes

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