Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb83c400777f32…

MALICIOUS

PDF

38.0 KB Created: 2020-08-15 07:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd5189e9227b4d7721a446401c191c5 SHA-1: f1c6d6232bbac023aa57d5d57900c8acc74c0ae8 SHA-256: 77bb83c400777f32f034b340e14ba3e02f7f645435beb39673d1669d2d1a898d
150 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 potentially malicious redirectors or SEO link farms. The primary malicious link identified is 'https://ttraff.cc/wb?keyword=pdf%20difference%20checker%20online', which is likely used to redirect users to further malicious content. The document body, though heavily corrupted, contains text related to 'Pdf difference checker online', reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=pdf%20difference%20checker%20online
    • http://files.leithgordonltd.com/uploads/1/3/0/8/130813362/sefopemirugome_loxirexive.pdf
    • http://files.pennstatecic.org/uploads/1/3/0/7/130775744/1740744.pdf
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/78324502925.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/18218624768.pdf
    • https://cdn.shopify.com/s/files/1/0437/2732/3301/files/69971989898.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/60228271571.pdf
    • https://cdn.shopify.com/s/files/1/0436/5431/6197/files/20332005409.pdf
    • https://cdn.shopify.com/s/files/1/0437/9734/8514/files/wowekanozis.pdf
    • https://cdn.shopify.com/s/files/1/0440/6811/0488/files/suzonuranexotixukoko.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/85459952200.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_off00005a36.bin
2667104a81d6b35e902aa2719b014445bce9858121bafaa2a882d864b372e4b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A36 4784 bytes
font_01_sfnt_off00006a6a.bin
e1b3dca86eeeb280bbaa9c7647879c3e2b739b52410797ceb848248369c10b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6A 9804 bytes

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