Malicious PDF — malware analysis report

Static analysis result for SHA-256 141618a6ea50c5f7…

MALICIOUS

PDF

33.2 KB Created: 2020-11-04 23:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c44cba7445204525b9f6d41279702be2 SHA-1: ddda0c6a51cee3fc748e3d6ff659ac1321d79abf SHA-256: 141618a6ea50c5f7cc3f5c13436de5aa9eb20213c34e31417e75e1c7f13de1ee
184 Risk Score

Malware Insights

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

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 5

  • 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.
  • 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=2007+taylormade+burner+driver+for+sale In PDF document text
    • https://kigokowolabewal.weebly.com/uploads/1/3/4/1/134132594/tosawuto-bepomabor-tajupana.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/8139d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fa315542f575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f870660c58f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_5f9ce93b1e1d4.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/vipamuw_vikosulubokip_gezolotefoliza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408587/normal_5f9efde31c87f.pdfIn PDF document text
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/3823752.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/177911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_5f997c337b58c.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/22e187f3f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8fcc84a4d7f.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/forupokisip/oretachi_ni_tsubasa_wa_nai_episode_1_english_dub.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_off00004357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4357 5616 bytes
SHA-256: 40f77abf2d93787c75f71105269fe6b0207041b41137a2f5a9f63e9aef0bda05
font_01_sfnt_off00005666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5666 9816 bytes
SHA-256: 1d8a54a216fcd275bca2c44f7c935c9cb0d1bdf11c9eb39d6cc0032bac1eddd2