Malicious PDF — malware analysis report

Static analysis result for SHA-256 399e403bcb60bfec…

MALICIOUS

PDF

47.4 KB Created: 2020-10-12 12:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e9f3c607ac49bf01e70a5d2792908185 SHA-1: 8ab177555f6a8118d3b4446a5489229d6ce80fbe SHA-256: 399e403bcb60bfec42433715e19867d3678d02eab92e3f4804b31c005ce24d5b
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including a primary redirector URL, that lead to potentially malicious content. The document body, though obfuscated, contains text suggesting a lure for downloading an application. The presence of a malicious redirector and a link farm on disposable hosting indicates a clear intent to distribute malware or lead users to malicious sites.

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=dolby+atmos+app+for+android+6.0 In PDF document text
    • http://sasokut.ultimatelimos.co.uk/uploads/1/3/2/6/132696056/fb4edd.pdfIn PDF document text
    • http://sakirodod.2in1website.com/uploads/1/3/1/8/131856959/493476.pdfIn PDF document text
    • http://files.birddogbtv.com/uploads/1/3/1/4/131453124/lagefobirewegat-pukaloli.pdfIn PDF document text
    • http://files.eurokreations.com/uploads/1/3/2/6/132681556/rawedoxunig.pdfIn PDF document text
    • https://site-1037864.mozfiles.com/files/1037864/tometedabewoveloxuram.pdfIn PDF document text
    • https://site-1039224.mozfiles.com/files/1039224/24631255560.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/94190452807.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/faxavujerefuparozolotox.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/tuvigalon.pdfIn PDF document text
    • https://site-1041933.mozfiles.com/files/1041933/rinuxosufamugobovep.pdfIn PDF document text
    • https://site-1037893.mozfiles.com/files/1037893/48145972389.pdfIn PDF document text
    • https://site-1048482.mozfiles.com/files/1048482/zugiwes.pdfIn PDF document text
    • https://site-1038714.mozfiles.com/files/1038714/rizonesav.pdfIn PDF document text
    • https://site-1038709.mozfiles.com/files/1038709/judora.pdfIn PDF document text
    • https://site-1042733.mozfiles.com/files/1042733/24118962653.pdfIn PDF document text
    • https://site-1039491.mozfiles.com/files/1039491/82398679561.pdfIn PDF document text
    • https://site-1038765.mozfiles.com/files/1038765/35345511377.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6308 5756 bytes
SHA-256: 86a79306f55b10b32d5dbfec5541c48699addc72cd20729832c4b116bc417ae4
font_01_sfnt_off0000768e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768E 10628 bytes
SHA-256: 1b7f263ad6ba1eb75aca120f8bbc9843eaa4a02da3505edd546f876eac11b01e
font_02_sfnt_off00009aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABA 16340 bytes
SHA-256: ee8b8f013b6f51ea08ae5b70d5412f202f6a9076b23c75f4a41c6f6118619bdf

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