Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6aa65bd6d00cc9…

MALICIOUS

PDF

43.1 KB Created: 2020-10-28 02:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e5d081f172e2b2818579f6ef1b4263e6 SHA-1: 0f4b512d554419feda3aaa2512a264eca1b730c5 SHA-256: ac6aa65bd6d00cc91860bb6046854475d8831658622cf0b96523de2f5e0725a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDFs, a technique often used to obscure malicious redirectors. One such redirector, https://ggtraff.ru/strik?keyword=ready+seal+deck+colors, is explicitly flagged as malicious. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm designed to lead users to malicious content.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=ready+seal+deck+colors In PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/e7ffb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5f9244716962d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f98a4884515f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f989b707f613.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/pitekozesu.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1140105.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/7789983.pdfIn PDF document text
    • https://jusopara.weebly.com/uploads/1/3/2/6/132681150/gezekimenare_mutiguluwet_jodadewezen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/calendar_2019_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/8954789207.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/d_d_wizard_spells_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/gilexalefikodetuxakoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0341/5197/files/72380764487.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/sigudokeguj.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/85120125061.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EED 5108 bytes
SHA-256: 5ed2738642d0729b78b6dc0aa96ee049c1d49019193befaea8187971bf6a8c6e
font_01_sfnt_off0000705f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x705F 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off00007bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBF 10436 bytes
SHA-256: d0a07dd211bb0ed373a63acead0cddc3873b9326912fb6ececb24c67a19d0ffc

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