Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7a56436940b537…

MALICIOUS

PDF

36.7 KB Created: 2020-08-16 00:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a5b1f281415fbfd2df822647c2d291 SHA-1: 768af859a1fe277ca88f2dc0bb48f1a745ba2b15 SHA-256: 5b7a56436940b537d2aeddbb8ee695de12b4924392ec80f0e60231f39089dbf3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, including one that redirects to known malicious infrastructure. The document body text, though corrupted, suggests a lure related to a school inspection report. The presence of multiple embedded links, many pointing to Shopify domains hosting other PDFs, indicates a link farm or redirection scheme designed to obscure the ultimate 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.ru/pify?keyword=knowepark+primary+school+inspection+report
    • http://savabe.davishouseofcatering.net/uploads/1/3/0/8/130874674/gududakarutoposose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/wibaloga.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/21199675781.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/jidojogesasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4694/files/52995860639.pdf
    • https://cdn.shopify.com/s/files/1/0447/1462/3130/files/consequences_of_biodiversity_loss.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/gisinafagagikexofug.pdf
    • https://cdn.shopify.com/s/files/1/0443/2792/7964/files/lolinipujuduvegotoruke.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/87904851492.pdf
    • https://cdn.shopify.com/s/files/1/0434/1163/6381/files/cydia_ios_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/freight_claims_in_plain_english.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/jugomupigudumal.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000505e.bin
4816840cdb05ba323eefa56b0886519e2045514a5fe7d028c724c741aff3f205
pdf-font-stream PDF embedded font (sfnt) at offset 0x505E 5400 bytes
font_01_sfnt_off000062a0.bin
ddd8519ff445175edd51f48c42b41c74ba2d47844c5a366c810818a052e8e204
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A0 9804 bytes