Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a584b05b42a445d…

MALICIOUS

PDF

51.4 KB Created: 2020-10-23 17:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ee1ea4ff160da3af40640c8704fc8f SHA-1: 7628837c0566c0dbb5eeb7b5ffbb913f88ef4bd8 SHA-256: 4a584b05b42a445d67e4cbd1f54ace2b1b6cc7336193d852c926fc357cabce82
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, forming a link farm, and one of the primary links points to known malicious redirector infrastructure. The embedded URL 'https://ggtraff.ru/strik?keyword=libro+de+ciencias+3+quimica+secundaria+editorial+santillana+pdf' is identified as a malicious redirector. This suggests the document's purpose is to direct users to potentially harmful content or further stages of an attack.

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://ggtraff.ru/strik?keyword=libro+de+ciencias+3+quimica+secundaria+editorial+santillana+pdf
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f87d3e172dcf.pdf
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f90a30d28542.pdf
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8d65a9d1cac.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xereromejiv-koxozirusoror-moxonujis.pdf
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/lebiruzu-tefam-vudatakit-nofixokuv.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/292e5a3c.pdf
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f875694ba437.pdf
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f90b507b724e.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f88d2db6fd78.pdf
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f89c6e181546.pdf
    • https://cdn-cms.f-static.net/uploads/4376602/normal_5f8e0fe79fd99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc5003fd-3e06-4509-b91f-9cef9a7f8f37/91150422539.pdf
    • https://uploads.strikinglycdn.com/files/a4f66ef9-fd4c-4919-80c7-21cd29b8e817/51883766102.pdf
    • https://uploads.strikinglycdn.com/files/739ceee9-c538-46af-9c0f-d6bd2c879cec/4529538468.pdf
    • https://s3.amazonaws.com/wilugugo/1810008040.pdf
    • https://s3.amazonaws.com/leguvefu/xenophon_anabasis.pdf
    • https://s3.amazonaws.com/fekazudabo/nsk_ball_bearing_catalog.pdf
    • https://s3.amazonaws.com/nezanurugega/acceptance_letter_for_scholarship.pdf
    • https://s3.amazonaws.com/subud/17934737788.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_off00008287.bin
848e72b90634518e0b4f74c2cdf8b0816979767d05b02a7bc4eb90edc432187d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8287 5672 bytes
font_01_sfnt_off000095b7.bin
b66b480e89b02bb26d7128b970b89385b6f8072be3429f187930ddd897663471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B7 12096 bytes

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