Malicious PDF — malware analysis report

Static analysis result for SHA-256 b865a32c59ed44d4…

MALICIOUS

PDF

35.9 KB Created: 2020-08-15 08:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6508184dee3e4a8c557a3d512bc9cc38 SHA-1: 58aad9fb0d625544572cfb89b1501656e17b96d7 SHA-256: b865a32c59ed44d4177c91e82eab3c9439d1351f426fe607149b4d7e19fae801
120 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Reflexive and relative pronouns worksheet' and the malicious URL, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous links, likely for SEO manipulation or to host further payloads. 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=reflexive+and+relative+pronouns+worksheet
    • http://files.theunfinishedsoul.com/uploads/1/3/1/0/131070362/wuzabil-kiberitur-gezig.pdf
    • https://cdn.shopify.com/s/files/1/0437/2375/1575/files/denuxebutivoki.pdf
    • https://cdn.shopify.com/s/files/1/0438/1288/0544/files/41784141724.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/14704536900.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/fatobepebidenovemalarisan.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/xebuwekodunotupoguzubu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/68846328215.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/24033829588.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/tuvaxijuzaxazasikiwuzimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/borislav_stankovic_necista_krv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4101/2382/files/40914626899.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1318/files/tomb_raider_legend_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/pdf_file_test_print.pdf
    • https://cdn.shopify.com/s/files/1/0427/3097/9495/files/13105950001.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_off00004e49.bin
0bd04c2730aee5cef561c6bdd1f89b29227c9ed751c96851731bf4fb9cb2d7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E49 5420 bytes
font_01_sfnt_off000060d3.bin
40763134a4df7717645e12f51ed4b2f53c1de0f8510fb8a353b85fe9b3e28cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D3 9876 bytes

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