Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51a4ed8907c1bce…

MALICIOUS

PDF

35.6 KB Created: 2020-11-07 17:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f092fae9a32a6c15b3a3bb4cc9104ee5 SHA-1: 3931e8ca7d15c75fff09cfa09c38f32201e0b493 SHA-256: e51a4ed8907c1bce2c17ad85d0354e59837b86f0dd562ca36b9b678cda29cedb
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://cctraff.ru/aws?keyword=unblocked+games+77+papa+louie In PDF document text
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/povofule-wowunusa-kefazidirib.pdfIn PDF document text
    • https://mebogizudoredo.weebly.com/uploads/1/3/4/4/134472702/4845922.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/8058195.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/766c51683fd8c46.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/fasikex.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00004c94.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00004c94.bin)
    • https://vozunoba.files.wordpress.com/2020/11/xojadu.pdfIn PDF document text
    • https://fepefik.files.wordpress.com/2020/11/dusufegazebineve.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://nuzosov.files.wordpress.com/2020/11/54917128667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cb4271-98dd-416c-ada4-f5800317ab23/70042846021.pdfIn PDF document text
    • https://nazoteviv.files.wordpress.com/2020/11/britney_spears_mp3_songs_free_downlo.pdfIn PDF document text
    • https://judepikewen.files.wordpress.com/2020/11/types_of_antennae_of_insects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db525abe-e7b7-4c3b-b431-877e03a95b37/zigozurevuvin.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://kagobovug.files.wordpress.com/2020/11/getozolas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2affedb5-ceaa-4c99-a499-e370539127b0/4272581840.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 extracted file (font_00_sfnt_off00004c94.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C94 5572 bytes
SHA-256: 0ba470bb397b4ff89ad212c7a39e5b6c33ac7438bcd8583756a8b991bedf6494
font_01_sfnt_off00005f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 10076 bytes
SHA-256: 5f3fb1607eda6235432dddcfd0a7268753cb1b10e95340187dbe95ff424363fd