Malicious PDF — malware analysis report

Static analysis result for SHA-256 b333184d003debb9…

MALICIOUS

PDF

42.0 KB Created: 2020-11-03 19:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: abb13929bf35f31b8a55b7b1d835d87a SHA-1: 9c58c933130eb696f836b3cc4518ef04a40ee9a0 SHA-256: b333184d003debb97650f2445c4de533adbe7b20d63b0743576e937793cd11c1
124 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=thermal+fuse+dryer+whirlpool In PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/vitaxobilar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_5f9fc1af137ad.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/movew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5f9efcac228cc.pdfIn PDF document text
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/92dc79ee0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f8de0836cf1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5f95d8e19e480.pdfIn PDF document text
    • https://rosotomana.weebly.com/uploads/1/3/4/5/134585450/2484994.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/b3bc499d-6efd-4031-880f-6a185813f0de/tetiwulavo.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/m_series_zoll_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/miller_s-22a_wire_feeder_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6412/2276/files/geometry_dash_2.1_apk_pc_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421ff28f-ba14-4573-aa70-e297b1255031/samurai_jack_episode_8_season_5.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_off0000653d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653D 5424 bytes
SHA-256: 19a65cae07dff2802187bbbc72071acfa6d0bb03ee8dc256a9348aedcb043ce7
font_01_sfnt_off00007798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7798 10548 bytes
SHA-256: 2df8b9aa89c9ef4d1b1f81705421740446b12d6d683f34aab54eb5c83a6ae641