Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd51780902f5ca4…

MALICIOUS

PDF

42.2 KB Created: 2020-08-02 09:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1494c7b072de4392516a8f8ebdcb4ac SHA-1: 89102547519889fad76e7f4c60a23fc1eee80817 SHA-256: 5fd51780902f5ca4cca6c4ed6552a562142c2bb6f047b1cd8421b0188f923db5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=nys+form+nf-+2', is flagged as a malicious redirector. This suggests the document is designed to lure users into clicking through to malicious infrastructure, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest malicious intent.

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=nys+form+nf-+2
    • http://files.thepinkbeadshop.com/uploads/1/3/1/6/131637257/e6798.pdf
    • http://files.mrhso.org/uploads/1/3/0/8/130874526/8336049.pdf
    • http://files.drnataschasantos.com/uploads/1/3/1/4/131437457/fivuf-wekomewagosikuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5666/0633/files/kisutakotoxerunawam.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/1454866759.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/taviwapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31184917419.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/zuwufirapiwifiwamovarepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/4884263773.pdf
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/55671567586.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/54994989554.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/safokujazixiseditujamesut.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/falatitanizovibodotoso.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_off00006898.bin
6814b3a12050aa035576c6936191e78f84672594ded8caf44ae1f6d0fb11c2de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6898 4904 bytes
font_01_sfnt_off0000794d.bin
0a71fd1076f1718bb8ac902c4f63664f9d4896beeea9406980d997b734a183a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x794D 10392 bytes