Malicious PDF — malware analysis report

Static analysis result for SHA-256 884af497e7404a7c…

MALICIOUS

PDF

48.9 KB Created: 2020-07-21 07:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 642e338d75e0e38544f797d032f3c480 SHA-1: c91b17d96848f09bb8a637e29fd48bc8d52423e8 SHA-256: 884af497e7404a7c776ab0b2943005dd7471b2f0e3940f7f12386e4724549eba
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 external websites, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as containing a mass external link farm. The ML classifier also strongly indicated maliciousness.

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=guyton%20physiology%20pdf
    • http://files.livyou.org/uploads/1/3/1/3/131379971/pumodazurinil.pdf
    • http://files.dominicmartinez.com/uploads/1/3/2/7/132710575/pemikovumonoja_xowapodaze.pdf
    • http://files.takemyhandcaitlin.com/uploads/1/3/1/3/131380848/62635d86f133.pdf
    • http://files.welcometoamyland.com/uploads/1/3/1/4/131437490/8124888.pdf
    • http://files.mesajuniors.com/uploads/1/3/1/4/131453749/8056776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/pedogak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/52409669039.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/ramikusubegadawob.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/19179996745.pdf
    • https://fanokuvawiza.files.wordpress.com/2020/07/neregixegisipox.pdf
    • https://kemimabaz.files.wordpress.com/2020/06/49120910528.pdf
    • https://mewowubo.files.wordpress.com/2020/06/bazuvigoganadalugu.pdf
    • https://vewulox.files.wordpress.com/2020/07/dofiditojitalutusugovidig.pdf
    • https://jadulotixen.files.wordpress.com/2020/07/88174340115.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/1708939273.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/73597808291.pdf
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/tivavoxowolixapuzirito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/dinasevutesemogewakom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/86869834466.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/misarofeliga.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/88200822421.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/peratexedabapirox.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_off000080cf.bin
cb1aef38352e97c4e8ad68f75f1ce2488f1a1b0a21ef0f6345f3ffd649a3cfe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CF 4896 bytes
font_01_sfnt_off0000917a.bin
92c42110888ca5e95bc0ef885f25ce6035b003ae3851f3a2c1b8f0fa68465044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917A 11292 bytes

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