Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f520a8f9d79f71f…

MALICIOUS

PDF

50.9 KB Created: 2020-11-05 06:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 277452f9acc1c059265b6af013776dd2 SHA-1: d7372ea4ff88db35875f775d35c7c900e093bd34 SHA-256: 3f520a8f9d79f71f8d815e8b731c3ef439ac4c5d9a9cc64471cc1d4070ceebd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=ngk+bpr5es+to+champion+spark+plug In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_5fa2db97c32d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f9118517a0fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5f9d68eeb5dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8710312d91f.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/4644439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_5fa04b52f382a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/dokulixugimitivilozupuz.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/2353739039.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/72823406508.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/spyder_fenix_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/54634717655.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/29589746114.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/best_dancers_in_the_world_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8715 5644 bytes
SHA-256: 9ba6a388e3e7143f51ddfa2c388b0ab3ed8b4a52332e6cbd3370f636458e70e0
font_01_sfnt_off00009a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2D 10744 bytes
SHA-256: 79c347abd10215f94d5a4db26cd043a7d0e18f72874edddbec512756a04e09b6