Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3f58ac6c35b611…

MALICIOUS

PDF

47.6 KB Created: 2020-11-04 06:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2990a38571025442a3c4efc1bcb8f806 SHA-1: d674e4a3c2bfb39fab5e390a0658db1a6bcbe55d SHA-256: 4f3f58ac6c35b611eaa65fc7e8467d60458beea7d87d5bbdab7a13ac263d15e1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a manual download. The presence of a 'download button' lure and password instructions for an archive further suggest a malicious workflow. The ML classifier strongly indicated maliciousness, and the embedded URLs point to known malicious redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ttraff.link/123?keyword=honda+civic+2004+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f9112c76cbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_5f9fa622671a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f9cab79e63bc.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/veleb-mifiguba-kipituboxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8c9a1057b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5f97563e7805d.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/dewimiwivup.pdfIn PDF document text
    • https://debekekuwafa.weebly.com/uploads/1/3/4/4/134473288/4399779.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/lekiginuwoziked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f87e60744600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_5f9c66952d8e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f89130064841.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/nitatotol/pamegojabusoganipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efac0fd-133a-4e77-a395-c3bae70af599/gexekipofatogolopet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000705b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x705B 5408 bytes
SHA-256: d8e430eb94edd0ae42cd60aa3211dfcfc54289b0ff8398ca0f9501b4bd2e2077
font_01_sfnt_off000082bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BB 1828 bytes
SHA-256: 93be6ffae20bc6daf2b9cedd8b6106235c1054a6214cc2a290c9def1cb5833a8
font_02_sfnt_off00008bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 10592 bytes
SHA-256: 15589f835225ee8daa4be3ee863a5dc23496ea535b9c44ef47b7b161fb235791

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