Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d27480d72dbfed…

MALICIOUS

PDF

45.4 KB Created: 2020-10-05 10:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a733fdf2ffa1b28f4f43f24ceed4c26 SHA-1: f30ef1132d284c480733ea87baf5b51800d8d4fd SHA-256: 37d27480d72dbfed1fa39e7859045824622faa9f9e47362d0bdf170050e66926
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document body itself contains URLs that are likely part of a link farm designed to distribute malicious content. The primary attack pattern involves luring the user to click on these links, which are hosted on disposable domains.

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://ttraff.link/pify?keyword=lg+vn280+manual In PDF document text
    • https://site-1039725.mozfiles.com/files/1039725/1613726194.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/fizokewemupuxurelanibunu.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/11581154459.pdfIn PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/jopugezezadavujubuwor.pdfIn PDF document text
    • https://site-1038776.mozfiles.com/files/1038776/vobamorolasidini.pdfIn PDF document text
    • http://tizuwu.ikhlastours.co.nz/uploads/1/3/0/7/130775388/mupemiwuvotepakaw.pdfIn PDF document text
    • http://files.bronzebeautylounge.com/uploads/1/3/1/1/131163957/sidusofife.pdfIn PDF document text
    • http://xabed.thomascreekbaptist.com/uploads/1/3/2/7/132710770/vafewinekeka-xalapologuval-sevavanug-fanug.pdfIn PDF document text
    • https://site-1048442.mozfiles.com/files/1048442/firujele.pdfIn PDF document text
    • https://site-1038836.mozfiles.com/files/1038836/vegajipe.pdfIn PDF document text
    • https://site-1037003.mozfiles.com/files/1037003/33820927832.pdfIn PDF document text
    • https://site-1039806.mozfiles.com/files/1039806/15936906980.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/49459684711.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/36027170546.pdfIn PDF document text
    • https://site-1042279.mozfiles.com/files/1042279/49036318102.pdfIn PDF document text
    • https://site-1042841.mozfiles.com/files/1042841/54458228888.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_off00007434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 5200 bytes
SHA-256: 30fc42a2d1ac97546147f68ac95f3fde4ed693247b8acbe17b6fdf670f41b710
font_01_sfnt_off000085e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E4 10284 bytes
SHA-256: ee6e0ce59d09e536632c9e996985a258757a5e690312010dffec69937455b72d

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