Malicious PDF — malware analysis report

Static analysis result for SHA-256 0440ddbfac255bd5…

MALICIOUS

PDF

38.3 KB Created: 2020-08-12 22:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a3beb10dccb0b62b6b6834c0b983fd SHA-1: 9ebea82a4524586ed7ba25a1c01d15f4a82d9590 SHA-256: 0440ddbfac255bd562aa56827fdf51140a7114a50b742a858f06b330a1ca3ed8
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, suggesting an attempt at SEO poisoning or link farming. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=kenwood+smoothie+maker+recipe+book+pdf'. The document body, though heavily obfuscated, also contains this URL and other PDF links, reinforcing the malicious redirection attempt. No scripts were extracted from this sample.

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=kenwood+smoothie+maker+recipe+book+pdf
    • http://files.herbkauderer.com/uploads/1/3/1/4/131437402/9368229.pdf
    • http://files.verdant-table.net/uploads/1/3/0/7/130775126/vitewe.pdf
    • http://files.workofheartfacepainting.com/uploads/1/3/2/6/132681452/2402484.pdf
    • http://files.bitsnpieces.ca/uploads/1/3/1/0/131069893/vageduzupalapur_zobawaporiwif_digojibolu_zabixaponega.pdf
    • http://files.littleatelieryc.com/uploads/1/3/1/6/131637362/zavovimizakawukovik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/alejandra_kamiya_cuentos.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/67462695794.pdf
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/sewilejikawumapasijilud.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/wedafaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/47800285127.pdf
    • https://cdn.shopify.com/s/files/1/0436/1319/2349/files/vunafunatexijaligupawew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/85613450916.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/lesonaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/19347124789.pdf
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/47445901021.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/bifuxuradakusa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/tizatobozosaduf.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_off0000559f.bin
335f7eb2f4cfb4f0e12c935bf569577ed676c320dcabdc77fc486d0c255bf747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 5628 bytes
font_01_sfnt_off000068a8.bin
a4b35bcef9f53121cf4cf794d2589ad8ed7509f1246921ca8ea1e308de4b6363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A8 10592 bytes

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