Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77fa6d2172e2cb4…

MALICIOUS

PDF

49.6 KB Created: 2020-09-30 19:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 25d23518ac3f0708fe747baa486f9f83 SHA-1: f83170299008976f67b50e5ad2c42ce2b9be20a4 SHA-256: c77fa6d2172e2cb45a0c8e9441465fc2055803ebddff3afbad9ef75bace72552
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, appears to contain keywords related to search terms, suggesting a tactic to trick users into clicking malicious links under the guise of relevant information. The ML classifier strongly indicated maliciousness, and the presence of multiple links to suspicious domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=pune+ring+road+map+pdf+2018 In PDF document text
    • https://site-1037911.mozfiles.com/files/1037911/35051669937.pdfIn PDF document text
    • https://site-1036699.mozfiles.com/files/1036699/21984530369.pdfIn PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/varakawukafez.pdfIn PDF document text
    • https://site-1038898.mozfiles.com/files/1038898/kuvobimovobiga.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/pifat.pdfIn PDF document text
    • https://site-1037246.mozfiles.com/files/1037246/nunovekum.pdfIn PDF document text
    • http://latepi.texasangiesadventures.com/uploads/1/3/2/7/132741508/7135791.pdfIn PDF document text
    • http://files.jameshuntermusic.com/uploads/1/3/1/0/131070526/sevaziwedonebela.pdfIn PDF document text
    • http://rugajuwog.andrewdoming.com/uploads/1/3/1/0/131070765/mavogawelaso.pdfIn PDF document text
    • http://baxesonej.lonegoosecrossing.com/uploads/1/3/1/4/131408432/724159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4050184e-50fc-483f-88dd-fb7bb22f2577/relotomafelof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eed44a2-35a5-41f4-98a4-7d768f6204d8/vaxuvileb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c239b43f-9e88-41f0-9186-226b58b512fb/ferekasojotelutona.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_off00005a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A01 5472 bytes
SHA-256: f21cbc74aa8fbc00c387d92fa316bb8d6f49bbf5075f9372745cc8b8971bd9b4
font_01_sfnt_off00006c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7E 12984 bytes
SHA-256: d5e8dfb6c2fe92072525c7c290c3f65ec697bacc8a91571505f9d2c656579371
font_02_sfnt_off000095ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95EE 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off0000ab07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB07 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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