Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c5502cae97de9d…

MALICIOUS

PDF

50.7 KB Created: 2020-07-22 15:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 573289f0a123a804afdfd114857c1221 SHA-1: 81baf32c38c4e4e4c5779cc9192b1e083a68523b SHA-256: 13c5502cae97de9d9971f72aee054db72c30598b51e9dd4af674b427c82c57b5
162 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.ru). The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=programme+festival+avignon+off+2019+pdf
    • http://files.sweetwhiskshoppe.com/uploads/1/3/2/6/132682471/3629897.pdf
    • http://files.serlutions.com/uploads/1/3/1/3/131383581/246daa400efd.pdf
    • http://files.gofmtogo.com/uploads/1/3/1/3/131398380/bonerulam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/rofudoledozokij.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/sawiriparuvapebezivotipa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/matuvixe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/86468699309.pdf
    • https://denazafoxow.files.wordpress.com/2020/07/samejisiluvotenafu.pdf
    • https://labidip.files.wordpress.com/2020/07/kubomapamizonabuxa.pdf
    • https://xagonete.files.wordpress.com/2020/07/gorineraxarigetenujolorud.pdf
    • https://jidiluda.files.wordpress.com/2020/07/tozesupinir.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/13984187103.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/guzavevimomopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/sotexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/13092831587.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/66735409603.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/kekolaxolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/diwaxodakipa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/15783012601.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/57464461429.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_off00008668.bin
0db09acd2e87a80b3b90af0cb56fd7d93565696007edeb15ef808ce812615cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8668 5692 bytes
font_01_sfnt_off000099b3.bin
c20d9bce35c22d67738aef69b143adeb8565cb7e29d1d217462eec85662dd2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B3 10296 bytes

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