Malicious PDF — malware analysis report

Static analysis result for SHA-256 367605a2d34c78b9…

MALICIOUS

PDF

43.8 KB Created: 2020-07-20 10:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59ef8440259cad0e5cfbd53d8faa162 SHA-1: 81d6c5d3f4f34959d1aa9d392d09616b84ae21d1 SHA-256: 367605a2d34c78b9996c11d3439b7eabbd9910ee9456615ab9b68b3f94aa2586
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and contains links to known malicious redirector infrastructure. It also features a link farm, suggesting a tactic to artificially inflate search engine rankings or distribute spam. The presence of embedded URLs and the overall structure point towards a malicious document designed for traffic redirection or SEO spam.

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=pages%20to%20pdf%20en%20ligne
    • http://files.thepeacefulpup.com/uploads/1/3/1/4/131453902/67a34668.pdf
    • http://files.power2motivateme.com/uploads/1/3/1/0/131070459/2607418.pdf
    • http://files.ladymekaellademure.com/uploads/1/3/1/4/131437623/puvemo.pdf
    • https://gufakiv.files.wordpre
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/25953382966.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/dunozinogukesovawog.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/33737645952.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/nipujakub.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/visewedevemi.pdf
    • https://gufakiv.files.wordpress.com/2020/07/bizapigopewuzejewuzowezep.pdf
    • https://rubuxunusu.files.wordpress.com/2020/07/xulatej.pdf
    • https://weweganuzuk.files.wordpress.com/2020/07/xibakisufumulefefovuzavum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/62042492950.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/3656547101.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/13465962138.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/77089238403.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/38215186827.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/38090291877.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/97991173016.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1679/files/66450825682.pdf
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/tokugewo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c5a.bin
7d766a05b8622d9614792aa58eeec193c11b62c0c444a9d9168193fce58b214e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5A 4900 bytes
font_01_sfnt_off00007d11.bin
c27887d89f26d62106fc336fec929779582b8ac5144b4abf9806db92f94a90cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D11 11056 bytes

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