Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ecb8ee6af59779…

MALICIOUS

PDF

34.9 KB Created: 2020-07-10 19:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c59af49361eca2bc8bba87b5bbc561 SHA-1: 2e3ca19ccf4c26e57141a742aa6f3a76feb64db8 SHA-256: f8ecb8ee6af59779abd0b2402a760d5b99dab99122c4cd1178b65c34c34beedf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to a known malicious infrastructure at 'ttraff.cc'. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm. The document body contains metadata suggesting it was generated by wkhtmltopdf, and includes the same suspicious URL found in the heuristics.

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.cc/wb?keyword=possessive%20adjectives%20multiple%20choice%20exercises%20pdf
    • http://files.celebrating40.com/uploads/1/3/1/3/131379868/woxidurugonekekevuk.pdf
    • http://files.kristinasdesignpalace.net/uploads/1/3/2/7/132710780/wugefetud.pdf
    • http://files.connectedhealingllc.com/uploads/1/3/1/8/131856713/6690941.pdf
    • http://files.elsvandeweyer.com/uploads/1/3/1/0/131069812/1356226.pdf
    • http://files.zamdevelopsj.org/uploads/1/3/1/1/131164534/7449164.pdf
    • http://files.helpatexasteacher.org/uploads/1/3/0/8/130814630/411253.pdf
    • http://files.wedronecostarica.com/uploads/1/3/0/7/130740180/40beb3eef2a.pdf
    • http://files.wanlinbicycletours.com/uploads/1/3/0/7/130776603/marak.pdf
    • http://files.microneedleregulatory.org/uploads/1/3/0/9/130969209/giwuvizalapunemaf.pdf
    • http://files.flopinions.net/uploads/1/3/2/6/132695569/deffb096fa382e.pdf
    • https://kidedifubom.files.wordpress.com/2020/06/jopafakigavipepofisunuxip.pdf
    • https://wedadisakab.files.wordpress.com/2020/06/67849691653.pdf
    • https://gajutumanuk.files.wordpress.com/2020/07/24710863157.pdf
    • https://doraxurewaz.files.wordpress.com/2020/06/74762702590.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71895705060.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23083433767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29876283886.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_off00004aa5.bin
250e62c397af147dd29296218d8ee5aa6a4d6c60ac5765832804b09f645bb5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA5 5376 bytes
font_01_sfnt_off00005cff.bin
1adfbe3eeaed8eb9f60fef3f0f4e91c92d565ff88644b8641be0a33a295d91a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFF 9696 bytes

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