Malicious PDF — malware analysis report

Static analysis result for SHA-256 843c6ec93d2139c1…

MALICIOUS

PDF

71.8 KB Created: 2020-10-07 11:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92af3bb5380d8fc3526383d8ca3b07c1 SHA-1: e2197deae8372f17d0ade20152fad4903dba2611 SHA-256: 843c6ec93d2139c1a85e8a40c426a4b5869bb85d64986160aa844a5557d4a2c7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL similar to the one identified as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the PDF is part of a link farm hosted on disposable infrastructure, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mooladhanam+malayalam+book+free+download In PDF document text
    • https://site-1043337.mozfiles.com/files/1043337/kisolojenori.pdfIn PDF document text
    • https://site-1043032.mozfiles.com/files/1043032/18597062386.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/17949275372.pdfIn PDF document text
    • https://site-1043456.mozfiles.com/files/1043456/8034283550.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/makovajarit.pdfIn PDF document text
    • https://site-1042007.mozfiles.com/files/1042007/bafag.pdfIn PDF document text
    • https://site-1037897.mozfiles.com/files/1037897/39379920465.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/40794464240.pdfIn PDF document text
    • https://site-1042777.mozfiles.com/files/1042777/xoregipum.pdfIn PDF document text
    • https://site-1038744.mozfiles.com/files/1038744/86426455793.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/88011241671.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/bademirekikegumuwefusez.pdfIn PDF document text
    • https://site-1040036.mozfiles.com/files/1040036/lasivuvixupedotajigedomar.pdfIn PDF document text
    • http://files.charleybarneswriter.com/uploads/1/3/2/6/132682668/ba9a11e3dc303.pdfIn PDF document text
    • http://vuwasar.wendycooneylightingdesign.com/uploads/1/3/1/4/131438110/2893348.pdfIn PDF document text
    • http://nizelaxem.garden-artworks.com/uploads/1/3/0/8/130874368/92b233b296e519.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_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 5372 bytes
SHA-256: baa835b9b3e357af74e66787b268788f108f4f2c32990077e6989ab8c879b84f
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16784 bytes
SHA-256: e1ea9af87c49590b1af34fae44d2cc4486e3d9b3ee244448a78c5b4d9809aa57

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