Malicious PDF — malware analysis report

Static analysis result for SHA-256 43db3b8deecf8af2…

MALICIOUS

PDF

32.7 KB Created: 2020-08-19 22:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3dc9e0876ecbdd014656a8a950f1e66 SHA-1: 325af569f496cbfe5c3671a09fe31c9f98d47652 SHA-256: 43db3b8deecf8af2867aa7bf9856ceeedacb194d4d2d20869db3dab5cfa6f3de
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm or a method to distribute the malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=halving+numbers+year+2+worksheet
    • http://files.mymobilervservice.com/uploads/1/3/1/4/131482887/a1fd395664b.pdf
    • http://files.legalandcommercial.com/uploads/1/3/1/6/131606330/jetuvuzumalut_votidub_lepijepofokat.pdf
    • http://ferida.synapticbiology.com/uploads/1/3/0/7/130775934/ragofos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6535/1075/files/tilerifeniparuvo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2438/2114/files/subaretutide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/monufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/jijakamoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/3091/1899/files/prot_warrior_talents.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/8472415836.pdf
    • https://cdn.shopify.com/s/files/1/0453/2869/5451/files/toxosugofozeli.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_off00004239.bin
61e0451be95e46856ca21f75c68649dd62867249fe05be28d2973f40a73cc81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4239 5648 bytes
font_01_sfnt_off00005557.bin
053e207b7ba0394c2e2680751e2332d426a844661956a861ae18d51b53ddefc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5557 9136 bytes

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