Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6de68282a67ae36…

MALICIOUS

PDF

36.6 KB Created: 2020-08-17 02:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f390bd3251e181450d2e8e82a60246b SHA-1: 26d7c305a3a1b10538f716522826a196e092ad76 SHA-256: e6de68282a67ae366abf6675a717e0ce9790c38073cf49dc0cadc8ee85d7bd4e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a worksheet and the malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the malicious destination.

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.com/pify?keyword=chord+perpendicular+bisector+theorem+worksheet
    • http://files.hamcogardennetwork.org/uploads/1/3/1/8/131856476/dc0d79bce71c8a.pdf
    • https://cdn.shopify.com/s/files/1/0430/6914/5241/files/kekogozezubulukarovezewuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/juzenupilozemuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/diffrence_entre_adsorption_et_absorption.pdf
    • https://cdn.shopify.com/s/files/1/0431/8681/5139/files/77351336456.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/fetigavu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8818/1400/files/dunasurazepaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/4395/2539/files/76695043102.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/pedatitifogil.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_off000050e8.bin
cb88f56b82544d6bb11fb173971bc6a078f793a9b3b6905a595654ea3c05cd75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50E8 5512 bytes
font_01_sfnt_off00006378.bin
7b404d6365ebd1e3e87f8139c21f5f0db4917ebf63dd868b65eb3e2d95f1fa14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 10040 bytes

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