Malicious PDF — malware analysis report

Static analysis result for SHA-256 20676f3f97662d35…

MALICIOUS

PDF

43.3 KB Created: 2020-07-31 15:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2b8f3495fe6be0ae5da984ea9290f5f SHA-1: 225d1f566dffe7baadf311422104652aace24659 SHA-256: 20676f3f97662d35d169777982c8ba221b41b75b30a6b3cf0521543c9b109f69
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic identifying a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its content beyond the embedded links. The presence of numerous Shopify-hosted PDF links suggests a potential SEO poisoning or link farm strategy to distribute malicious content.

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/wb?keyword=ancient%20egypt%20webquest%20pdf%20answer%20key
    • http://files.conwaysound.com/uploads/1/3/0/8/130813694/4a9ed2.pdf
    • http://files.pinehollowranch.com/uploads/1/3/0/9/130969284/c294f1b91.pdf
    • http://files.bossymommy.store/uploads/1/3/1/4/131408369/86e6d3d1a83.pdf
    • http://files.saikatahamed.com/uploads/1/3/2/7/132740723/3741960.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/bikofuzokexakubadepokon.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/mejulomotoferura.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/59080963311.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/53325883221.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/37262258706.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/98536874355.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/75098952896.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/jasotanibewasanigokaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/69278128804.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/3605194958.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/fekitidexozoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/muwifidilovuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/tufomapokepif.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/sejimezotebisineze.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_off00006a92.bin
d4370bee6aa9ec1b98bf83866720cc0653d9c9c1ca7d01a88221e7d45116f989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 5576 bytes
font_01_sfnt_off00007d9b.bin
b7fc2b87f51952aa4a26ec102900a0c338e8fae671762785e00f646b63bada14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9B 10132 bytes

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