Malicious PDF — malware analysis report

Static analysis result for SHA-256 b532a0d21abe3aba…

MALICIOUS

PDF

38.5 KB Created: 2020-08-08 00:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0a155b6d83fc3bbaf43f1687671fe0d SHA-1: 419a5fa5668c206b3e29ec84a5c11aacc5b1ea26 SHA-256: b532a0d21abe3aba0c4529ba8dcf7db7e8397fdcd49bec29c70a10b12dff9a07
150 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it contains a large number of embedded links, identified as a PDF link farm, with many pointing to Shopify domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful sites through these numerous links.

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=unir+varios+pdf+en+linea+gratis
    • http://files.en.oslomamma.net/uploads/1/3/1/6/131637889/xeligaj.pdf
    • http://gumidad.rosinakhan.com/uploads/1/3/1/4/131483281/terobi.pdf
    • http://files.desertjewelsinc.com/uploads/1/3/2/7/132712206/zudorifi_dujij.pdf
    • http://files.college-boundplayerportal.com/uploads/1/3/1/6/131637889/godamowodasumudowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/tiwimexesexatuvad.pdf
    • https://cdn.shopify.com/s/files/1/0440/1361/7302/files/endorsement_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/6596676406.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/74652811167.pdf
    • https://cdn.shopify.com/s/files/1/0432/5978/9472/files/zizifevamo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6859/5112/files/rumuwonuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/87433451021.pdf
    • https://cdn.shopify.com/s/files/1/0445/3846/2372/files/kingdom_hearts_2_rom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/vefiletipelolonufag.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/29991711616.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1109/files/80145105672.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/tapumorigemezitojit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/vco_voltage_controlled_oscillator.pdf
    • https://cdn.shopify.com/s/files/1/0445/6821/5716/files/pdf_amendments_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/62131562016.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_off000055b9.bin
747b7cc9462992bb0cb6b78c7fbc82f4191bff198eab59bc09eb284578796751
pdf-font-stream PDF embedded font (sfnt) at offset 0x55B9 5260 bytes
font_01_sfnt_off000067b9.bin
d8386d5387127cb4106655fd6fa872617eb9c44b2922db499839e2feb2167cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 10920 bytes