Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f67355b25a0e4f…

MALICIOUS

PDF

44.0 KB Created: 2020-10-02 13:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0b5c57c16f43ddce6d14fe29f96b395e SHA-1: f3ab426a0a8cdca08565ffe484df35388d2990fa SHA-256: 57f67355b25a0e4f4ed49285c624219623cdcdc0ff07acb6d85ad471c87e90ee
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains numerous embedded links. One heuristic specifically flagged a link to known malicious redirector infrastructure, suggesting the primary goal is to redirect users to harmful websites. The document body, though obfuscated, contains URLs that are consistent with this redirection behavior.

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=e-commerce+2019+business+technology+and+society+%252815th+edition%2529+pdf In PDF document text
    • https://site-1039753.mozfiles.com/files/1039753/kizepore.pdfIn PDF document text
    • https://site-1039227.mozfiles.com/files/1039227/26016099823.pdfIn PDF document text
    • https://site-1040683.mozfiles.com/files/1040683/70472670745.pdfIn PDF document text
    • http://weferuz.thefitnessmasters.com/uploads/1/3/1/4/131438137/a8bff98.pdfIn PDF document text
    • http://files.snohomishmidwives.com/uploads/1/3/2/3/132302759/kifemude_bakuxura_bajaki.pdfIn PDF document text
    • http://files.2artrooms.com/uploads/1/3/0/9/130969820/6608870.pdfIn PDF document text
    • http://fixobab.worldbankawards.com/uploads/1/3/1/8/131856516/lipedufanixawu_samubivino.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/dibukakilenubez.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/vuzoro.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/14989123125.pdfIn PDF document text
    • https://site-1037120.mozfiles.com/files/1037120/rabal.pdfIn PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/mowuwemofed.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/pajawapufoxojewijonefegi.pdfIn PDF document text
    • https://site-1037230.mozfiles.com/files/1037230/92608419570.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6814 6560 bytes
SHA-256: 36a1bda9fe6af619c37bd8a93f457adbd883370d587f5b870fa7f7ecf2cd2036
font_01_sfnt_off00007e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E59 10780 bytes
SHA-256: 53bf0aca88f5dc1a2c092f0afac7f5d1f64a61468d6cd71d9bca34242015c2be

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