Malicious PDF — malware analysis report

Static analysis result for SHA-256 739cdced7e760ebc…

MALICIOUS

PDF

49.7 KB Created: 2020-10-05 21:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1f2afaa530e8729829dd051c3c77eded SHA-1: 89f3019633018babf7b72da97e247d3660312fe3 SHA-256: 739cdced7e760ebc11419ddcc684b528c8016d6303626aae38e08f32b5e5a8b2
132 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 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=receitas+low+carb+pdf+free In PDF document text
    • https://site-1039224.mozfiles.com/files/1039224/69638729138.pdfIn PDF document text
    • https://site-1043329.mozfiles.com/files/1043329/zakaxaraj.pdfIn PDF document text
    • https://site-1039278.mozfiles.com/files/1039278/73523422399.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/bezavimabosuja.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/13422200826.pdfIn PDF document text
    • http://files.tylercreekconsulting.com/uploads/1/3/2/6/132681362/zikefaxokufu-makubiduz-kujomaj.pdfIn PDF document text
    • http://files.murray-company.com/uploads/1/3/0/7/130776591/0cce6a2e7f6.pdfIn PDF document text
    • http://files.jessietaylordesigns.com/uploads/1/3/1/6/131607438/kekem.pdfIn PDF document text
    • http://meput.expressionsartglass.com/uploads/1/3/0/8/130873730/3b271f2a4ef17.pdfIn PDF document text
    • http://files.literallyanythingmovies.com/uploads/1/3/0/7/130775134/zosase.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/1/0433/4646/0830/files/momosofalapofobanag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2955/6131/files/58114377236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1223/3637/files/hindu_art_paintings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7928/5915/files/winston_salem_aa_meetings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301f4cb3-8540-49ac-a67d-3d3366885491/28285285444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1089735-7549-4566-8fee-b567e51ae431/26981670992.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653D 5388 bytes
SHA-256: 1c9026b76d140d12c46f0261707ae8f64cab88512e03f7c4d5e748dc7fd8e4b8
font_01_sfnt_off000077a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A7 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00008035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8035 10352 bytes
SHA-256: 1a802d7b5e1434c4fbe8b757c0a1096168ff653f8c42f0c2b23f9f22d4caf801
font_03_sfnt_off0000a3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D7 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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