Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c96b71027b9c581…

MALICIOUS

PDF

39.2 KB Created: 2020-08-24 20:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 162cdd2f858632668d85dbecd0c8198f SHA-1: db0639bfadcba26e9326501b27fabc036a732a1d SHA-256: 4c96b71027b9c5819b1a85ee18cc16b589f2cdefd2b0f5501efea667524b94fd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also features a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO poisoning or link farm tactics. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.cc/pify?keyword=cursive+writing+worksheets+maker
    • http://bafaw.watersaltbohojewellery.com/uploads/1/3/1/8/131857284/985582.pdf
    • http://romigofip.animaltrackingandbirdlanguage.com/uploads/1/3/1/4/131483154/jajita.pdf
    • http://files.tanessakennels.com/uploads/1/3/1/6/131637257/mosoxenidotun-biredo-fudajefu.pdf
    • http://files.jesussolorio.com/uploads/1/3/1/4/131483214/230752.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/21102436249.pdf
    • https://cdn.shopify.com/s/files/1/0459/9562/2559/files/lucky_brand_jeans_fit_guide_mens.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/45249246243.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/17842610988.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/75367025641.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/mabepatafebev.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/gafoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/76355175914.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/mugofolavawan.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_off00005c5d.bin
55af68f39e5973ce3629b0d32b0621aa1bf3283277cfd6ea40994bb926b4cbf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5D 5188 bytes
font_01_sfnt_off00006ded.bin
7dda82ff38504d80f0f7bd40644577951081dd668152f6484dcec2568e05b8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DED 10060 bytes