Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4b73309f188a21…

MALICIOUS

PDF

51.0 KB Created: 2020-08-11 07:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1d5703cb968b301b7073dc112f37ca SHA-1: 45ab80db4a51bb5840f14dd03204dc1de649ec90 SHA-256: 1c4b73309f188a21076abaf1fc3093be1c9d87b42e16ffdc4b560fd252616950
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with keywords related to financial documents. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly indicated maliciousness.

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=banking+services+chronicle+magazine+november+2020+pdf
    • http://files.skyfootgoddess.com/uploads/1/3/1/4/131406806/329971.pdf
    • http://files.connectingcoffee.com/uploads/1/3/1/1/131164372/53921add2c9.pdf
    • http://files.oakstreetnurseryschool.com/uploads/1/3/1/0/131070561/bijazexojelajojuwaji.pdf
    • http://files.scotthanberry.com/uploads/1/3/0/7/130740008/5c6f034f07.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/72688845386.pdf
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/pokemon_yellow_gameshark_codes.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/basic_mechanical_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/34850838338.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/20147547551.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/94850133078.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/frame_of_reference_physics.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/damekos.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/khng_m_c_file_trong_outlook.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/totovujowisumadape.pdf
    • https://cdn.shopify.com/s/files/1/0434/0829/4044/files/lonaluzulukarixexawepimo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/57578927695.pdf
    • https://cdn.shopify.com/s/files/1/0431/6148/5471/files/fipujijujusev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/12612636101.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/1/0440/2806/7990/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008633.bin
cbec08d5aec2c7374d69894ad9946ee7fd94697917364fc42c1904212dec687a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 6204 bytes
font_01_sfnt_off00009b27.bin
68232ca50ead6c87f59255e8e1c849e0f3d7038079e73288f24863e2304eb2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B27 10688 bytes