Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c51818605ccd9f…

MALICIOUS

PDF

52.7 KB Created: 2020-09-29 23:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d421a54e152c2944492eb718de95f247 SHA-1: 30656f12f7a33a446f5563fc75c1aa3a2746ac8c SHA-256: 55c51818605ccd9f12615077866dabf21d15021000e72468bc685925957d0df5
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=terjemah+bidayatul+mujtahid+pdf In PDF document text
    • http://files.authorphilip.com/uploads/1/3/2/6/132681250/gikoniroxe-kafitudiv.pdfIn PDF document text
    • http://files.stephanierodemann.com/uploads/1/3/1/8/131872105/453086c1.pdfIn PDF document text
    • http://files.sarasotagreenpoetry.com/uploads/1/3/1/4/131438177/sukulati.pdfIn PDF document text
    • http://watok.artisanhandfood.com/uploads/1/3/2/7/132712336/jetuliwamebu_jevotojig_naxuposa.pdfIn PDF document text
    • https://site-1037163.mozfiles.com/files/1037163/96245260348.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/modakedoxulexemazidipi.pdfIn PDF document text
    • http://nimit.rachelpagesings.com/uploads/1/3/1/0/131071145/budazotun.pdfIn PDF document text
    • http://zonalovu.koh-lantist.com/uploads/1/3/1/6/131637136/9502091.pdfIn PDF document text
    • http://files.alankendallmusic.com/uploads/1/3/1/3/131383934/9047129.pdfIn PDF document text
    • http://gemevabas.sustudiojewelry.com/uploads/1/3/1/3/131382243/nugizamekixuz.pdfIn PDF document text
    • http://files.thistlethorn.com/uploads/1/3/1/1/131164351/xuwonoseb_fujumowotadomu_lidebakipuwoxe.pdfIn PDF document text
    • http://files.elleextensioncils.com/uploads/1/3/0/7/130776343/rigoxugigawuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a308.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA308 19804 bytes
SHA-256: 45143a1e83b2542a3c31efb2762d6f506abac290b03a4080ae393f0fde0d25fa
font_00_sfnt_off00006df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF9 5368 bytes
SHA-256: c146dfd08ec3311afb1dcf9baaf13586d4114f37bf0e18901582c916bb2f2cbc
font_01_sfnt_off00008012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8012 10128 bytes
SHA-256: 44cfd7a1c32348863108d55255d2b4e81f092e0e657ced79d7d1e0f1e0fc7148