Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e4ae56563a1306…

MALICIOUS

PDF

76.7 KB Created: 2020-07-30 23:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2f428b8a6c1b6be78e852caa4794ff3 SHA-1: 7902f7c3c93a0850f691c544ea57582edd54e467 SHA-256: c4e4ae56563a13069721379978a4eeb23bd8ae574d66813916902877fa131323
152 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 Shopify domains but ultimately redirect to a malicious domain (ttraff.com). This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=portuguese+alphabet+pronunciation+pdf
    • http://files.emts.co.uk/uploads/1/3/1/8/131871614/susekexewo-genibijuj-retufida-kenogigedoj.pdf
    • http://files.twentyfiveknits.com/uploads/1/3/2/3/132302928/54dfca9.pdf
    • http://files.eazicandle.co.uk/uploads/1/3/1/4/131438692/ef1440aba9152.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/fovid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/96608243876.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/2736006776.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/bugapebed.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/pegebupatisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8077/7882/files/vekebane.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/zusiruvux.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/18988595866.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/50134879191.pdf
    • https://cdn.shopify.com/s/files/1/0436/2174/4803/files/fimikosariditubiwizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3403/3824/files/50152606988.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/kasesate.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_off0000dc56.bin
f980111b94d7596fa643534844458c8928a84aba4b052c873b59b4fbefeeb5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 5440 bytes
font_01_sfnt_off0000eecc.bin
c79f051989a2e4f2a09f94095e716c15dd26475886e31d7c0920ec7526b68982
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 18584 bytes