Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c652eacd0838e9b…

MALICIOUS

PDF

42.6 KB Created: 2020-08-10 22:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7551dd65117728b6579fd81b015d513e SHA-1: 4df9c7b885a96d9898e4488824a4a5beca3cdfda SHA-256: 8c652eacd0838e9b40ae29895a1cc3ec9e979bf33c9f4d16cf16ee637785ec76
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers this heuristic. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. The primary malicious IOC is the redirector URL.

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=critical+care+nursing+textbook+pdf
    • http://minava.normanmuseum.org/uploads/1/3/2/7/132741099/3792983.pdf
    • http://files.frenchreproduction.com/uploads/1/3/0/7/130775402/pebivipaw.pdf
    • http://files.kmrice.com/uploads/1/3/1/8/131858661/padabebe_defulelusexi_kanojavaku.pdf
    • http://files.erichreimer.com/uploads/1/3/2/6/132695714/6c9ce3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52945462890.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2102/files/python_directory_exists.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/bakunin_libros.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30698029692.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/wexukugelaxowulomolodaxon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/understanding_pathophysiology_canadian_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/zojififexadamileruwid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/25260323717.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/lowamibijixasavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/luromi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xadexuwewipibiduba.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_off00005bc1.bin
7db4aa9dcfc42b3a6ef9a04f555e0b2fea6a31cf0b1e3bf67d3f0cf3b72bc559		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC1 3304 bytes
font_01_sfnt_off000067a6.bin
5974d54e4267d4658bc281557ddfe717a39fe2beda2a32a17f2b7ad27b7f1973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A6 5500 bytes
font_02_sfnt_off00007a5e.bin
381bcdf3e3d50a5048f8fc5e91b3649d013eb977a621e97db4391b0264f5f824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5E 10200 bytes

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