Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e28185ac28b0f4…

MALICIOUS

PDF

38.7 KB Created: 2020-07-21 03:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d6416ed3b4a4d03b6a4eef3c61c1b4 SHA-1: 6f67a7d62d947c2a7c82050984cbf42e3c83a49e SHA-256: c8e28185ac28b0f4f086490b8c8fd60b5c4b911e714aa2d3451e112d1dec122a
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to distribute SEO-optimized PDF files. One of the primary links redirects to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Toeic grammar test pdf', suggesting a lure for educational content.

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.ru/pify?keyword=toeic+grammar+test+pdf
    • http://files.nationalinnov8tive.com/uploads/1/3/2/6/132682230/b9131e04.pdf
    • http://files.infantswimoviedo.com/uploads/1/3/1/3/131384208/9550787.pdf
    • http://files.extonbury.com/uploads/1/3/1/6/131607331/siwerawe-nemopep.pdf
    • https://nonujefo
    • https://cdn.shopify.com/s/files/1/0432/9567/0432/files/88015572325.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/zulidexugidudamanume.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/siwadajijozenugavuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90841244024.pdf
    • https://tanonikide.files.wordpress.com/2020/06/panuxolabilixosarozek.pdf
    • https://nonujefod.files.wordpress.com/2020/07/45833010321.pdf
    • https://fukoxep.files.wordpress.com/2020/07/91318896620.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/53551020101.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/sifajejepiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/kidex.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/76729657612.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/zemejorovadizuzogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/22285914136.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/43052907955.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_off00005ac2.bin
c254be8dbd888e929296966902e31d30f4e5f13d86f91063d15b7af89f45eee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 5076 bytes
font_01_sfnt_off00006c05.bin
101ef72f869489ba4487adc66d819ed5adbe25a35ae82a093abdb272a7741e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C05 9752 bytes

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