Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5fa935a2ef0dc6…

MALICIOUS

PDF

49.0 KB Created: 2020-08-25 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83bddcb6b812dd4257100388645157b9 SHA-1: e8a60d18a454dac38d4495f6ce66fabf76663441 SHA-256: cc5fa935a2ef0dc6fa2aa2a5bf9e3660b75dd9dbfa9bb0bd6f486688ddd15d54
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the ultimate destination. The majority of the links point to Shopify-hosted PDFs, forming a link farm. The document body itself is heavily obfuscated and contains the malicious redirector URL, suggesting an attempt to lure users into clicking malicious links.

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=java+apache+poi++excel
    • http://files.opadental.com/uploads/1/3/1/3/131379594/539cbd45a69b.pdf
    • http://files.nygreenhealth.com/uploads/1/3/1/4/131406977/bodovanasesug_tekegirigexeva_ninizeda_fawomobisogu.pdf
    • http://loxit.destinationhop.com/uploads/1/3/2/6/132683459/tawagazugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/32150403802.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/nozamulibijatalakijenofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/zegogefuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/2793/1034/files/18231226951.pdf
    • https://cdn.shopify.com/s/files/1/0461/6791/6696/files/13789863163.pdf
    • https://cdn.shopify.com/s/files/1/0465/1633/8838/files/calculus_1_limits_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/1465/1038/files/70927410369.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6257/files/black_hearted_song_mr_jatt.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4533/files/wamubuxowewud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/khatia_buniatishvili_libertango.pdf
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/40389611172.pdf
    • https://cdn.shopify.com/s/files/1/0436/2970/7422/files/xegilemitikovafibu.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_off00007620.bin
b412b591b9eb7fca032ae1d9e7c4fdba684d17c891d27307d9f0c670bb9af4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7620 4864 bytes
font_01_sfnt_off000086aa.bin
9f87f6d292b959396783424491f222b898a1561d43940fc9e442791dda7a1f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AA 16868 bytes

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