Malicious PDF — malware analysis report

Static analysis result for SHA-256 c449ffd8e1155147…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 01:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b19e3995b6d9446cba597f4df3c08d3 SHA-1: e7b2546bb6557faf0a3cd55db7045a62f49ac1c2 SHA-256: c449ffd8e115514718d81ad0e7bac2ed01ca2b6cb10973feadf702fff3b9ddbd
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to 'English grammar rules pdf' and the malicious URL. This suggests a social engineering lure to trick users into visiting a malicious site, likely to download further malware. No scripts were extracted from this sample.

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=english+grammar+rules+pdf
    • http://zumuzisu.cphcoffee.com/uploads/1/3/1/3/131379326/fd71c877.pdf
    • http://files.kcpanhel.com/uploads/1/3/2/8/132815961/1055807.pdf
    • http://files.canbryresearch.com/uploads/1/3/0/8/130874679/xodopazawaza_newusavon_kevilub.pdf
    • https://cdn.shopify.com/s/files/1/0432/1086/6851/files/temufufekixur.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/8489230218.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/17150409084.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/gif_to_webm.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/xuvogaxudimip.pdf
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/data_mining_tutorial_point_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4018/files/reading_skills_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/sociologija_knjiga.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/6131250441.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/30011669618.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/71511929362.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/51270795339.pdf
    • https://cdn.shopify.com/s/files/1/0432/4504/3880/files/rudekagafira.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_off00006c17.bin
431cacdbade511d9fc35043c74f015488e5d8933792a7cb54820c8d73e0b2dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C17 5412 bytes
font_01_sfnt_off00007e52.bin
dca082f750d1d059c1aba0d1734169c8032a9312758964e8fc9d614df5cc26b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E52 10248 bytes

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