Malicious PDF — malware analysis report

Static analysis result for SHA-256 5785e043d9e520e2…

MALICIOUS

PDF

34.2 KB Created: 2020-08-12 07:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e6c0e0b4efa6980925cf6176ce527d0 SHA-1: 2d52367a840fe2ea47313153c86264c4040cc3d8 SHA-256: 5785e043d9e520e2a404a225c556893b5dc51533707920e5c1c1da6fb299a946
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting seemingly benign PDF files. However, one critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains references to 'samurai sudoku printable pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking the malicious link.

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.cc/pify?keyword=samurai+sudoku+printable+pdf
    • http://files.sailingthetechseas.com/uploads/1/3/0/7/130776763/vorij.pdf
    • http://files.countrychicksoaps.com/uploads/1/3/0/7/130776558/8ad9e8.pdf
    • http://dopegix.evartchamberofcommerce.com/uploads/1/3/0/7/130739415/putejitubanugosunu.pdf
    • http://files.millercounselingserv.com/uploads/1/3/1/0/131070604/ca9f1af929ac2.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/budget_line_economics.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/reverse_linked_list_recursive.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/71158905644.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/billing_system_project_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4437/files/tema_si_viziunea_despre_lume_enigma_otiliei.pdf
    • https://cdn.shopify.com/s/files/1/0432/9527/7214/files/71479346698.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/ird_payment_slip.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/draft_river_basin_management_bill_2020.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/komowene.pdf
    • https://cdn.shopify.com/s/files/1/0433/4406/8773/files/ledexevubosorobipu.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_off000048b2.bin
043aa0b14d77bb3aef0e522fee4719d142104362feacb1956fa84eaed2317957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B2 5496 bytes
font_01_sfnt_off00005b46.bin
32014cb5fe64d64a4e48b26cf20a34bc0a6bf40f51af30d5869c4e3cf50f13d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B46 9536 bytes

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