Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51089fa1705bfa9…

MALICIOUS

PDF

49.6 KB Created: 2020-10-01 15:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a990c43b7d1c572f32c57ae6e43cda3a SHA-1: b9e5bdb5d1fdf551d25758b07c6a5eeff5de4383 SHA-256: d51089fa1705bfa9880a4668c82943027d81a57c2aae98a86f7f7f1f31fc357a
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://ggtraff.ru/strik?keyword=bingo+chart+pdf In PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/mifagego.pdfIn PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/99134908838.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/vibapupepa.pdfIn PDF document text
    • https://site-1038849.mozfiles.com/files/1038849/jevenufor.pdfIn PDF document text
    • http://files.alisondowell.com.au/uploads/1/3/1/4/131454352/2436010.pdfIn PDF document text
    • http://files.atabeira.com/uploads/1/3/1/4/131406864/wugilaxa_telukekar_vazatig.pdfIn PDF document text
    • http://files.ac-done-right.com/uploads/1/3/1/8/131871864/bekelo-napitikimamo-futaguja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/050b03a5-9062-4908-a035-2838c99f66f2/jazogusilepoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55e0231-75ff-4cbb-b80e-d23196b3c36a/xixipasadamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42fb24e-3ddf-40a2-bee4-338c00298ce4/taroxiboxilawojemisos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7df72a8-8e9c-4e0d-909f-108501cfd160/relezobobema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98516dd-19fc-4305-a9f8-672bb721557b/netudijizev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d424132-786c-4f3b-8010-6782804344d3/51840903032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88a70e2-26f4-4309-a3e3-014e940b0eca/73490065348.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_off00007819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7819 4924 bytes
SHA-256: e1ebe196a54c911a6beca61a97e25c2928b40f3e0498ed7f0eeb5e8f050e562d
font_01_sfnt_off000088c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C2 10200 bytes
SHA-256: 090d902342cc86ad76e0ef4ec18dad752a13eb6fd7c4389bb28502d4189b7ec5
font_02_sfnt_off0000abb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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