Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a16ac461a867d08…

MALICIOUS

PDF

50.6 KB Created: 2020-08-07 06:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 910047066005a33110fc2e2b4e7a8d3b SHA-1: 612a69d5a40de05d50571c767d86dc943f4f291f SHA-256: 9a16ac461a867d084e0e816ad3b315737a4a7ff78ee03cf182f5eb1a03234651
120 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'calculus 2 final exam pdf' and embeds multiple external links. One of these links, 'https://ttraff.ru/pify?keyword=calculus+2+final+exam+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDF files, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary attack vector appears to be social engineering through a deceptive document title and embedded malicious links.

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=calculus+2+final+exam+pdf
    • http://files.imcbrands.com/uploads/1/3/1/4/131409017/eb24ade.pdf
    • http://files.cafedatalkalamode.com/uploads/1/3/1/4/131483550/3bbbf7.pdf
    • http://files.chesapeakeorchestra.org/uploads/1/3/2/3/132303118/1feb61dc7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lenibokufilitixesokan.pdf
    • https://cdn.shopify.com/s/files/1/0439/3353/2315/files/candlestick_chart_patterns.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/tesofolebonadus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/23247547950.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/90632355560.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/nixukudebogefon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/58468067308.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/7332973761.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/89882003486.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/bifowolaxinopiripogob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/37370553399.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ec7.bin
caa53385fde90172ce1be59039f8e22e550e786155db556f9c72b1681ee38d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 5120 bytes
font_01_sfnt_off0000801f.bin
3af6d1cee8f9fe6d5dafea997c77d517a6c5a47dbc203f4c4dc64cd5da77b324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 15100 bytes
font_02_sfnt_off0000af24.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 4324 bytes

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