Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e260f689b182f8…

MALICIOUS

PDF

44.3 KB Created: 2020-10-09 01:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca0f62b39f62d2e9bb97a5314b0ae8bb SHA-1: 7169b3af807546ff75c84d5f944e638e626f376e SHA-256: 50e260f689b182f89e59931c3f7b9fbc3b4842186caeecfefa1f46144712a4e7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and heuristic firings strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine the exact nature of the lure beyond the presence of links.

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://ggtraff.ru/strik?keyword=the+odyssey+graphic+novel+gareth+hinds In PDF document text
    • https://site-1041486.mozfiles.com/files/1041486/929807162.pdfIn PDF document text
    • https://site-1038382.mozfiles.com/files/1038382/11622239711.pdfIn PDF document text
    • https://site-1037221.mozfiles.com/files/1037221/bivuwikisomazapapexa.pdfIn PDF document text
    • https://site-1038765.mozfiles.com/files/1038765/73393415096.pdfIn PDF document text
    • https://site-1039999.mozfiles.com/files/1039999/41904886470.pdfIn PDF document text
    • http://files.walkingwithieke.com/uploads/1/3/2/6/132681734/33884.pdfIn PDF document text
    • http://zobuvitu.twincityphotography.com/uploads/1/3/2/8/132815828/9f01c63392.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/vimorokemiwolufiri.pdfIn PDF document text
    • https://site-1039863.mozfiles.com/files/1039863/55936809015.pdfIn PDF document text
    • https://site-1037906.mozfiles.com/files/1037906/56567754827.pdfIn PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/bedunakatofulumeref.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/10624b5c-1d8b-437e-9702-f6e14329ab06/lokaxuxevudifilaribunem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14efcdc7-b86c-485a-8d1d-9ce1995fd4e1/vaxavanopefevofomizefimej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9f5f2d-f124-4683-a5fd-0a39d9f9662f/rojikomudowaji.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6073 5232 bytes
SHA-256: cbb89c53248fa5c604ff08d5fb23cdf74221ca06d6f196a6ac25b1c9d5bda64a
font_01_sfnt_off00007248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7248 10676 bytes
SHA-256: b8640e181a58fa19ea9c81926585a7f81eb79509c295171ee799e6dbbd4c14c3
font_02_sfnt_off000095ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95ED 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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