Malicious PDF — malware analysis report

Static analysis result for SHA-256 926a6dc96046774b…

MALICIOUS

PDF

44.0 KB Created: 2020-08-14 01:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a6c0271883ccc0c4c8cd5c094deda30 SHA-1: 7c54f40d6e68f5837447fd1a1de0ebbd27a4d1f6 SHA-256: 926a6dc96046774b0a1df04afc150e604e389f0b0d1790a9434f5d8d062ca325
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=crosswords+with+friends+answers+8%252F+9%252F+19'. This URL is presented as a lure for crossword puzzle answers. The file also contains a large number of embedded links to PDF files, many hosted on Shopify, which is indicative of a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains the same redirector URL. 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.com/pify?keyword=crosswords+with+friends+answers+8%252F+9%252F+19
    • http://files.wilsonpublicationsllc.com/uploads/1/3/1/4/131438313/lebevel.pdf
    • http://tomije.buenobabe.com/uploads/1/3/0/9/130968973/wobafibogugunaf.pdf
    • http://welejap.4wardproject.com/uploads/1/3/1/8/131871825/5341750.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/amortized_complexity.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/hydroxyapatite_properties.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/bozaparosovawebisimudusik.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/5896628643.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/61079710351.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/kexozepirebason.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/etiologi_xerostomia.pdf
    • https://cdn.shopify.com/s/files/1/0439/5932/0734/files/lexical_and_grammatical_categories.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/human_psychology_books_free_download_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/buvixabajabojen.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_off00006d5b.bin
a0e295589f7ff870bf85701128710ca4faba586a381c2f902add04b45c373569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 5400 bytes
font_01_sfnt_off00007fca.bin
ad83c016f6bc8dc6eaa115c94296090b9dc4a9e0b3ed7b8e6d4d257632cde8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCA 10340 bytes

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