Malicious PDF — malware analysis report

Static analysis result for SHA-256 7404c40059a78723…

MALICIOUS

PDF

43.5 KB Created: 2020-07-22 02:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be6746b0e023d323df86116c20484a8a SHA-1: e5f9f64bc63b38816e4257e39c4cc796f9ae3908 SHA-256: 7404c40059a787231a629fc651f04ab12069b7c4177db8dcb49b97505f08d782
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 of which point to a link farm designed to obscure the ultimate destination. One of these links, https://ttraff.ru/wb?keyword=menschen%20book%20pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

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/wb?keyword=menschen%20book%20pdf
    • http://files.raphastar.com/uploads/1/3/0/7/130776168/7836318.pdf
    • http://files.terrifictuakau.org/uploads/1/3/1/3/131382330/dogesafibiluf.pdf
    • http://files.teachinghooks.com/uploads/1/3/1/8/131858045/3c94b0.pdf
    • http://files.haussonas.com/uploads/1/3/1/4/131407635/dosetepa.pdf
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/pikifiritefonolafev.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/76624966705.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/tuvoteruxebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://piwelil.files.wordpress.com/2020/06/voxulolukikawixefo.pdf
    • https://zufuxesew.files.wordpress.com/2020/07/wofokawoteberonipik.pdf
    • https://faxonitu.files.wordpress.com/2020/07/63998151538.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/29395570500.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/7449433459.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/purudimapesojuvexakejim.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/39634909479.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/72618874962.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/82166466315.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/tatokiguvonadopem.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_off00006b30.bin
71db18d4b725edf585136b2156f0ae7255240bb95c65ef37574ec50629e8011c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B30 4776 bytes
font_01_sfnt_off00007b53.bin
bed15676796f5ba1a5ff34d1cf80bfa1eb8a7c193f03bba71c67ee3b48c4db6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B53 11424 bytes

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