Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a71233bd1ddc88…

MALICIOUS

PDF

38.7 KB Created: 2020-10-05 04:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2e96ad93bee35be847da904cd8c0fed SHA-1: 08b441d0046b40a6674c0132e9719c4c3de773fe SHA-256: d7a71233bd1ddc88c66900ae1947e60f518ddac68c25e5ae887c15503f2155e1
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable hosting further supports malicious intent. The document body, though heavily obfuscated, contains URLs that likely serve as the redirection mechanism to a malicious site.

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=el+shaddai+flute+sheet+music In PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/69251334764.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/45709984798.pdfIn PDF document text
    • https://site-1036830.mozfiles.com/files/1036830/gelawatabodataluju.pdfIn PDF document text
    • http://files.thekellerguitar.com/uploads/1/3/2/7/132740905/d7ae8399.pdfIn PDF document text
    • http://kuzenop.africansoulinternational.org/uploads/1/3/0/7/130776791/5ae3ae9c8958.pdfIn PDF document text
    • http://sudunesa.thequestofjz.com/uploads/1/3/0/8/130814229/koninoxawibipop_bakukarelema_sukadawilex_bipadozebozoga.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/74514588296.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/gubeg.pdfIn PDF document text
    • https://site-1040216.mozfiles.com/files/1040216/zebupoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b90678-db2f-4a96-b424-d4298791bad0/34676850922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4d2488-149d-49bc-bb79-ea9ffbb94e73/xojupeliwifumagutumoxadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c538271f-73d4-401e-933a-dc1ddc4fde9f/pibexutusavebewupewejeriv.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_off00005b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B94 5124 bytes
SHA-256: b1ee6a0b0e3ed3521a1cfbebcd7c3c26e62c9424f1a7ded2394e9d971054c6df
font_01_sfnt_off00006ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE1 9864 bytes
SHA-256: 3af36cea352dbb5b00ba8adc5a2414b1b63c7047ab1cc19565a052e90a3c0099

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