Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f65f91ae24fc58…

MALICIOUS

PDF

34.7 KB Created: 2020-08-07 18:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7f7425aad829ee2be079a96bcde680 SHA-1: 2304c79e7b06f154046487ca3becacea6a670296 SHA-256: f0f65f91ae24fc5836fc4942fdde0e7e4f141ea77441a2f364cd61faf0ab5f82
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains the text "Brute force attack book pdf" and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious.

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=brute+force+attack+book+pdf
    • http://files.mrlibutti.com/uploads/1/3/0/8/130814232/newosujiverifa-susove-lulupe-wipavumojukoga.pdf
    • http://files.3rdpointproductions.com/uploads/1/3/2/3/132303068/2529dc.pdf
    • http://vufuwe.goatclean.com/uploads/1/3/1/8/131856584/8538961.pdf
    • http://panusud.firstaidforall.org/uploads/1/3/1/4/131409090/zomogikima.pdf
    • http://files.staceysandiegotherapy.com/uploads/1/3/1/8/131871951/8515414.pdf
    • https://cdn.shopify.com/s/files/1/0434/9594/8454/files/xavojavineragagufar.pdf
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/sonupijerevadivasodorul.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/roomba_500_series_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/35594802050.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/c_open_directory.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/seturumobowatodevawonib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/61411191734.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7779/files/woxofizipavobosififubuzox.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/bojimani.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/an_applied_approach_to_macroeconomics.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/el_camino_de_la_kabbalah.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/rufaneziluje.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_off00004b29.bin
04b3ed2b5b14e55b5aa8aab50e75ad2e39c47c32b707b7e91722458ed6fdce48
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B29 5192 bytes
font_01_sfnt_off00005ce3.bin
2c3410e816268f32d35a446286594c27566d736f425b0004f9b76a0a3464d191
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE3 9796 bytes