Malicious PDF — malware analysis report

Static analysis result for SHA-256 344a62ba473313ac…

MALICIOUS

PDF

62.9 KB Created: 2020-10-08 11:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05393443fddc92b8fded7268212c9420 SHA-1: f1432b7e281ce3e212d2c5ea7bee27f8725dde23 SHA-256: 344a62ba473313ac5c3c55c628fd33fe98c8d8a181f32fa44379283644771f75
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though partially corrupted, suggests a lure for a free song download, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=songs+of+dil+to+pagal+hai+free+downl In PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/79658036200.pdfIn PDF document text
    • https://site-1038710.mozfiles.com/files/1038710/kigavabokamabetux.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/53917922196.pdfIn PDF document text
    • https://site-1040339.mozfiles.com/files/1040339/tedisemo.pdfIn PDF document text
    • https://site-1039952.mozfiles.com/files/1039952/valotakunizivalepode.pdfIn PDF document text
    • http://files.qualityresusnyc.com/uploads/1/3/1/4/131437117/vabovotajasop.pdfIn PDF document text
    • http://files.thelinksconnection.co.uk/uploads/1/3/1/3/131380977/pamipiwoniziv.pdfIn PDF document text
    • http://files.tmfherefords.com/uploads/1/3/1/4/131437444/5153243.pdfIn PDF document text
    • https://site-1039460.mozfiles.com/files/1039460/82586850642.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/luzuvaw.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/3520324318.pdfIn PDF document text
    • https://site-1038783.mozfiles.com/files/1038783/53285823713.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/1/0435/3405/7621/files/gutojaxozajeke.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_off0000aa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA08 5500 bytes
SHA-256: 8eec4a8a4f4ea66b67b51349c372993572c9b1ecf25b277f9f95e322fc5056ba
font_01_sfnt_off0000bcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 15860 bytes
SHA-256: d525f7a6d0df3a5a55e14f3eb9ffb969bca19e91bd6fe4f50788faf72bb9e339

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