Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f1d552a351c73c…

MALICIOUS

PDF

41.1 KB Created: 2020-10-30 13:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5b306a47c7fe8843b123d3744f0ccbfb SHA-1: ddf0b47905f796f91e618cae65831dc02cb679e9 SHA-256: 30f1d552a351c73c42af7af9505df3b71232944a83f9a1a1f64ebcd4c15f8681
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://ttraff.club/123?keyword=ikea+accent+chairs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f884ef658755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f988f286f941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5f8b766fc32e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f915d04dd928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f8f833e4add0.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/nawud.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/7af12562e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/319c867b-cea1-46ee-823c-688941e682ae/58838813771.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/633659611.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/pilagu.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/contec_sonoline_b_fetal_doppler_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/asplos_2020_papers.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_off000062ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 4856 bytes
SHA-256: 0ca9fe90fea856570e49c89a9de60557c5e511b99c834479886cd3fd25190154
font_01_sfnt_off00007368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 10804 bytes
SHA-256: 0fcc1aba631315ff6ce53aea5f2f874ea99fbd8561ebfc74331e444d9294778a