Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7dede2141234928…

MALICIOUS

PDF

52.8 KB Created: 2020-08-22 07:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0eb2f8e0c85f7184c0332a629564fd7 SHA-1: 98d99ec0b1f1c9596fd4f27a366294887790a0c3 SHA-256: d7dede21412349280b6309e02fd4c9f06175b4569dcd7177cd62a6c1060ccfa7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious.

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=arjun+the+warrior+prince+3gp+movie
    • http://duxix.tollresidentgroup.com/uploads/1/3/1/3/131379874/4804045.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/67058202854.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/dapavifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/correlative_conjunctions_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0428/3616/4774/files/the_clash_white_riot.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/wokasunabolesenuninadoje.pdf
    • https://cdn.shopify.com/s/files/1/0440/3272/1046/files/sokimetij.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9805/files/dobokavab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/98418710314.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/lawotilorosibabur.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_off00008f7e.bin
74cb58603bc3277638413bcd630de6a5ff185a83cc9859cc7590264e0a4f3f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7E 5516 bytes
font_01_sfnt_off0000a230.bin
6c8a6c47529cdbd919c044322e5413d451cfea202c54340a71f5e8831a0d6c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA230 10544 bytes

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