Malicious PDF — malware analysis report

Static analysis result for SHA-256 df398250cdf2514c…

MALICIOUS

PDF

36.0 KB Created: 2020-10-16 00:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: fd79eb9925181edf550a0be41fd8e2e8 SHA-1: 60cd5b2cca2bdeb42701ea636a2b0f5890800acd SHA-256: df398250cdf2514ceaa6551ed0ed127f88b95196ed3110871b04700a6bab763d
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/strik?keyword=download+whatsapp+video+downloader+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f8742531a26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f881294c3981.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/nuxujulobi_mezugejodejamob_domizowi_gejok.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/9088325.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/fff4608ac61.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/xovilefuladoku.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/5092761.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/marema-zevaz.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/2c9812d110c.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/kuzazonerifamim-siromoruwefop-nemojiweti-fomirozadu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/7254167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f888691ef5d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8716d54a1a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f87598b3b0cc.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/1/0266/8658/7078/files/from_what_text_is_in_adams_fall_we_sinned_all_taken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8857/9233/files/warrior_weapon_progression_classic_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/stihl_fs100rx_manual.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_off00004fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFF 5264 bytes
SHA-256: 61ca103512b16f60f25796424cf0d0d884a382796236d4b8680e934a0e2f6009
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 9604 bytes
SHA-256: cfe125c0c0322aa70041560ab4da20df2628fc2f24f309de29ec2e1489509c85

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