Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99c299c54a5dbd8…

MALICIOUS

PDF

37.0 KB Created: 2020-08-24 20:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8fcdbd7d4f388fd1604a260adb0ba9a SHA-1: e1c3771744f996110f37a7cc051721ed1b1e8cf1 SHA-256: b99c299c54a5dbd8002175f11dbbb5ca444b7d3db12f40e2ce38aaa39623bf2c
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial entry point for malicious activity. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=believe+in+something+nike+meme+template
    • http://files.gojotekicon.com/uploads/1/3/0/7/130738666/6a38ff235d.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/31762831807.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/26608825356.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/circle_of_life_meaning_yahoo_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1923/files/gojikut.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8670/files/ad_hoc_network_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/23333251676.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/34945325383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/concept_of_share_market.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_off0000503c.bin
88e855aa9d6af5933caa240be80c36d4b7898982906477742c919a7d878c0aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503C 5308 bytes
font_01_sfnt_off00006231.bin
6b403ccfe93feb40620d8a98a642984e3a588a0a9bdf233fc214f782a0f9a619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 11008 bytes

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