Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99f6bfea6f90bc4…

MALICIOUS

PDF

37.2 KB Created: 2020-08-16 20:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa91dbf403ac09ed7f356d6312c6329 SHA-1: ab32f2a74a714f4bee4eceee4933a29dfc1fafc9 SHA-256: c99f6bfea6f90bc45f033cc907a4f9511432f8f6b05ebc3d87de4cd43dbc087e
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a mass external PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to create a large, distributed content farm for SEO poisoning or to host malicious content. The ML classifier also strongly indicated maliciousness. The document body itself is largely garbled but contains the suspicious URL.

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=histology+of+bone+and+cartilage+pdf
    • http://fuzoro.avahomedesign.co.uk/uploads/1/3/0/9/130969352/gusafo_luron_dewamufifize_jinaf.pdf
    • http://vaxaze.bunyiphotelcavendish.com/uploads/1/3/1/0/131070374/bininixuxosijir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9912/files/72492171791.pdf
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/vusajafowuduf.pdf
    • https://cdn.shopify.com/s/files/1/0439/4965/4184/files/dark_3d_live_wallpaper_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/79965869817.pdf
    • https://cdn.shopify.com/s/files/1/0444/1328/8614/files/roman_parthian_war.pdf
    • https://cdn.shopify.com/s/files/1/0431/3831/8487/files/26639553449.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/29319413247.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_off00005333.bin
1eaf04bef6381906b1b5b878b69172b62321a1c59ed1d5860e3c38d68f6b9886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5333 5524 bytes
font_01_sfnt_off00006605.bin
9707e36959d32f144bded5ac043a1cb4f396aaff138d37faf01bed9a893be894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 10148 bytes

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