Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5847c7ffa7e4c56…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 02:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d4732bfa6d4ce1f759da933b7ada52 SHA-1: dd2048e834a78387ca71915754aae94cfad4d041 SHA-256: e5847c7ffa7e4c56d827b0fd383544e7b8c54846b6b91c6c26e0185f798595c9
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.ru/wb?keyword=elementary%20communication%20games%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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/wb?keyword=elementary%20communication%20games%20pdf
    • http://wikasakax.sophisticatedladysalon.com/uploads/1/3/0/8/130874207/7475416.pdf
    • http://files.fischerworkshops.com/uploads/1/3/1/4/131453031/f57e1654d.pdf
    • http://files.nlcssteam.com/uploads/1/3/0/9/130969399/5219439.pdf
    • http://files.galleryatno6.co.uk/uploads/1/3/0/8/130874281/demijoxid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/mujebukeloxomojolevowara.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/79738568260.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/redig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/brokerage_contract.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/ntfs_3g_yosemite.pdf
    • https://cdn.shopify.com/s/files/1/0430/6255/8874/files/78672875588.pdf
    • https://cdn.shopify.com/s/files/1/0429/2886/5446/files/86941063576.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/jazukunaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/sinibikedixuzitemini.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/porabibevufateleru.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/gidijorutubevazabudam.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/
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/79738568260.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006825.bin
bd874d3dcc212f84be54cc85930f9f9b9beeb996e961adaf2029cee4413271cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 5532 bytes
font_01_sfnt_off00007aeb.bin
c3b63c2dbb79bc35126a6bf6aed3a58bcae007d53335c0ea0dfd822903151322
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEB 10688 bytes