Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac16721415774aa…

MALICIOUS

PDF

56.2 KB Created: 2020-08-17 12:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f35eaf9439557616204895e9b4a4b574 SHA-1: 547cc3de00a4cd5899338b6671a330cef69f155a SHA-256: dac16721415774aaab5214163dd7cecc5167dede77eb502157d6400f011b3ddb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links to other PDF files, a technique often used for SEO manipulation or to host malicious content. The primary malicious indicator is the link to `ttraff.ru`, a known malicious redirector. While the document body is heavily obfuscated, the presence of numerous external links and the specific heuristic firings strongly suggest a link farm or redirection attack. No scripts were extracted from this sample.

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.ru/pify?keyword=alimentacion+sana+oms+pdf
    • http://files.thearconline.org/uploads/1/3/1/4/131452989/nagivuda.pdf
    • http://files.gamechangernd.com/uploads/1/3/1/6/131606353/ximebumanuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/rtx_2070_benchmark.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/2007_polaris_sportsman_700.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/mefabozupijob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/26377736936.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/nekete.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/lowes_newton_nj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/95502922751.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/gst_information_in_english_download.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_off00009fda.bin
230e457589465e36c5a8dfb90f974f631d76bca05e747ac751a299ed2b1422ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FDA 5196 bytes
font_01_sfnt_off0000b169.bin
3003d012963778eafc3ab902c6c68d3bffe76e60728f5428c9b9536ca60cf0e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 10376 bytes

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