Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6883d867572b96c…

MALICIOUS

PDF

53.6 KB Created: 2020-11-03 06:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ac61625da2a239952fa61a3801b9ec1f SHA-1: 2c87491ce54b2f63ee1a1377f6853fbe57906fe9 SHA-256: c6883d867572b96c36e8f26abefa840ccadf3a62c213670c49dfb5d72957d2a4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggers the redirector, suggesting the primary purpose is to lead the user to malicious infrastructure. No scripts were extracted from this sample.

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://cctraff.ru/strik?keyword=bristol+40+sailboat+for+sale In PDF document text
    • https://nofexozodaxo.weebly.com/uploads/1/3/4/5/134522082/1741567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5f99c774f29e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_5f96433f22fbc.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/c90b8947b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/12267430-a878-4998-9a5e-81986f10891e/xatedutabuxavisogazurev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9575d50-21cb-45b0-b56c-1ac67dc13624/rivazubudasefobemasisik.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/56535214523.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/64179709248.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/keporokezegita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e86a2cc-a971-4316-8c74-3240cc21bee6/vibulidofisokusu.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/34846905803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a187d0-bed0-45d4-8dbc-472a7efd824c/foloxabajogotogivun.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/zudexujerometevejevojaj.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/dine_in_theater_in_west_orange_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/atal_pension_yojana_in_hindi_sbi.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/architecture_portfolio_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2b89bf-c260-4798-98b4-47cc94613435/61958199038.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_off000087c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C0 4860 bytes
SHA-256: ddac9b487fa15aa4b9baad8592d75869c0f93d525b9d2bb4cbb5fef6f4ee994e
font_01_sfnt_off00009854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9854 10236 bytes
SHA-256: 99fc0c9dc160defd63d28779c240741eb543bd17ac8cc2152c7cbdf2548cf85f
font_02_sfnt_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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