Malicious PDF — malware analysis report

Static analysis result for SHA-256 345b7b64134dc600…

MALICIOUS

PDF

42.4 KB Created: 2020-09-30 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 763a02656637aeb0a009103d75aa5690 SHA-1: deec9f8926734e68a261cd3386f1c6b45fbf4f49 SHA-256: 345b7b64134dc600aab05d232591730202fd68efda9184d150cceb4586a07636
232 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=autocad+tutorial+2017+pdf In PDF document text
    • http://zepimijes.designetchingandawards.com/uploads/1/3/0/9/130969284/sukonuruvuwu-viziwurasitus-fozomoloxiv.pdfIn PDF document text
    • http://tupizedi.adamflemmingdesign.com/uploads/1/3/1/3/131383483/zosuvomoxirojigizem.pdfIn PDF document text
    • http://wusumo.auntiemaileshawaiiangourmetfavorites.com/uploads/1/3/1/3/131380594/lonudubizupi_newavu.pdfIn PDF document text
    • http://ruruxi.savageseniorliving.com/uploads/1/3/1/8/131856235/bagakotorikoforosi.pdfIn PDF document text
    • http://nemem.mendocinofood.org/uploads/1/3/2/7/132712615/c6d851e669665.pdfIn PDF document text
    • http://files.shimfarmtour.com/uploads/1/3/0/8/130873872/3f05cc70e7f508.pdfIn PDF document text
    • http://files.artistcafeutica.com/uploads/1/3/2/7/132741352/fipogitudufalidikaje.pdfIn PDF document text
    • http://files.michaelmajchrowicz.com/uploads/1/3/2/6/132682230/f1f394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/97421146393.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4975/4519/files/konavikomelulovesubuxola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1533/9938/files/90363137035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4925/4050/files/mercedes_benz_price_list.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_off00006a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A91 5364 bytes
SHA-256: 370f40eaec3a987350739a19f1e31c15098bfa5f0499affbac16ff84b9e48a4b
font_01_sfnt_off00007ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CED 9452 bytes
SHA-256: 574ab2ad9353f35e8870ff1a18aea7ea61eb7ed37ba851c7c8a6de2ba1fb3c29