Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b2d8e1c222fb3a…

MALICIOUS

PDF

61.0 KB Created: 2020-11-06 02:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 84c19344e61575c7dcb437c404bdb84e SHA-1: 3e03af8573a8d46565b4907dfdcec3cc54e1cf40 SHA-256: 87b2d8e1c222fb3ad355eb8045926865d12a0eff0f040645eb29f3a7fb34b28f
184 Risk Score

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://traffine.ru/aws?keyword=discworld+mort+pdf In PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/7840343.pdfIn PDF document text
    • https://kexuminuki.weebly.com/uploads/1/3/4/3/134310960/bb5c273dd90a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_5f9b62567b39e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fa0ab79d60c2.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/fosiri-vasulex.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/62136e87e.pdfIn PDF document text
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/fepukifalu-kabazagunobog-wotunokik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f971bf44c293.pdfIn PDF document text
    • https://sopizelofixafav.weebly.com/uploads/1/3/4/4/134438569/gujopipifitibi.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/1238713.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/sepawi/76156553632.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/tomamujewiji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 16160 bytes
SHA-256: 64985907a8a07258ac9003bca4c165628066e19c9accdb607d17a0aa3dfa8c10
font_01_sfnt_off0000ac55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC55 5180 bytes
SHA-256: 7feae80dc7dd6920c2674185124c91d542034cc0dbb3c92f22e96c4bc98a982b
font_02_sfnt_off0000bdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF8 11940 bytes
SHA-256: c58431182fa51aa8b39b132eb7fdc4ade1c70ad1a8603e8a4a3640c989ec1609