Malicious PDF — malware analysis report

Static analysis result for SHA-256 74826b8feb7935cf…

MALICIOUS

PDF

46.5 KB Created: 2020-07-28 08:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff3ee30119be4c9fe8304efd1feab1a5 SHA-1: 5c773ef1a65146cef62a4e9cf87d9dad0b558d75 SHA-256: 74826b8feb7935cf948d9c27f2c73d0bf6e89a06f8052510fa078e5ae813959d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious content.

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=assembly+language+beginners+pdf
    • http://files.clairefrancessullivan.com/uploads/1/3/2/6/132695546/165993.pdf
    • http://files.empoweredmathematics.com/uploads/1/3/0/7/130776413/jorubisesa.pdf
    • http://files.treetopflowers.co.nz/uploads/1/3/1/6/131606968/f82b4d9643c38f5.pdf
    • http://files.dianas-gardens.com/uploads/1/3/1/4/131483445/deca061a.pdf
    • http://files.mercermovercompany.com/uploads/1/3/2/6/132681836/0f951389f7542.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/sulegomewalena.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/gipajajoduka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/xemaponijisanuduf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/mepikipepavama.pdf
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/64160650.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/lezigodavesabuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/rifulegovonedagukam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/6077606553.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/29513637843.pdf
    • https://cdn.shopify.com/s/files/1/0430/7147/1767/files/xewazusupesotejojanutepov.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/tojazewokozidaxunutafiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/tixukojaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/5110566516.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/kogijufus.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_off000077ee.bin
1e903545b8bd8dd5f027fb3dd72e705e739ae559362c088913bc4d43378b2045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EE 5284 bytes
font_01_sfnt_off000089bd.bin
f950f1ec4cb6ccc4f9ac577639e10d7fc3d56f541a71b11261e911b2c7dd0722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BD 10116 bytes

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