Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41034540a827878…

MALICIOUS

PDF

35.6 KB Created: 2020-10-03 23:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 476bb8d4557fb2163c0771f1e053dd91 SHA-1: bdb9352badc72dc6faabfccdcde47015d1f31d41 SHA-256: e41034540a827878d5aa0422411c46b051e06d2e93ddfeec44956642ccc6da0c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs that redirect to a malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting it is a lure for exam-related documents. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to deliver a second-stage payload.

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=2019+kpss+lisans+deneme+s%25C4%25B1nav%25C4%25B1+indir+pdf In PDF document text
    • https://site-1036760.mozfiles.com/files/1036760/folewaweji.pdfIn PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/35522743368.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/dowobarul.pdfIn PDF document text
    • https://site-1036944.mozfiles.com/files/1036944/42572159805.pdfIn PDF document text
    • https://site-1039829.mozfiles.com/files/1039829/gefizodixuz.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/befuxetujewelitafiset.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/16816153272.pdfIn PDF document text
    • http://rabom.pareto-chart.com/uploads/1/3/1/4/131453574/c8f27cf1a6.pdfIn PDF document text
    • http://wekatoxit.kierlandpop.com/uploads/1/3/1/4/131408229/dokimoji.pdfIn PDF document text
    • http://soluso.redarrowcounseling.com/uploads/1/3/2/6/132680896/3705405.pdfIn PDF document text
    • http://kudemom.castleknock08s.com/uploads/1/3/2/6/132680874/maginofimo.pdfIn PDF document text
    • http://files.constructionprogress.org/uploads/1/3/2/6/132695525/4012774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9629/6610/files/83352668405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1954/7036/files/11482549874.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7877/0085/files/westfield_high_school_jv_football_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9940/1629/files/womagezevapizigap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47B2 5732 bytes
SHA-256: b35e03bb9ce56032c1815176de37d8aac50205b68d1c6c24762e6c8e62c14465
font_01_sfnt_off00005b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2D 11100 bytes
SHA-256: f3c77d90afaf4a68c1027a5a548fb546b4e80417c3fe7c482aa39ffda95a0b10

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