Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ebb665c5d3278e…

MALICIOUS

PDF

51.1 KB Created: 2020-08-15 23:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88cf68c2367b19ebe4511a3958ddb8a SHA-1: 33bce448b035792d3169e44178c0b113dc70b408 SHA-256: 81ebb665c5d3278e539e36f42d6c481a06f26b4ae856f5ce040351a507213355
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML score and the presence of a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The embedded URL 'https://ttraff.cc/wb?keyword=visualization%20data%20pdf' is a primary indicator of malicious redirection. No scripts were extracted, limiting further analysis of direct payload delivery.

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=visualization%20data%20pdf
    • http://files.blainesworld.net/uploads/1/3/1/4/131453084/7289384.pdf
    • http://kuzosekag.seomid.com/uploads/1/3/0/7/130776394/vanakivodul.pdf
    • http://files.stgeorgestbishoyvisalia.com/uploads/1/3/1/4/131437750/438653.pdf
    • http://files.foundationofhope.us/uploads/1/3/1/4/131437862/sutekufo-lisuvizobuxe.pdf
    • http://files.essentiallyempoweredwellness.com/uploads/1/3/1/0/131070604/03996.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/19720676873.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/fg_knot_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/4002/files/79722218856.pdf
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/zonerotifujazupomerokeben.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/all_the_way_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/7309/3288/files/zekusedaladujutujumeraw.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/file_association_helper.pdf
    • https://cdn.shopify.com/s/files/1/0434/8755/9833/files/49241123688.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/midadekefabuwekiwelukufus.pdf
    • https://cdn.shopify.com/s/files/1/0435/1941/0328/files/13708430635.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_off00008751.bin
79bbf2db5ebb7cde5f3bd8f844ddef848624471ebd0dbaced4cc6366b605b056
pdf-font-stream PDF embedded font (sfnt) at offset 0x8751 4952 bytes
font_01_sfnt_off0000984e.bin
2467b6b5151b70c11951a4ba2d1809d17f7d7b2f48191434d28510ca4a186097
pdf-font-stream PDF embedded font (sfnt) at offset 0x984E 12700 bytes