Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c210c3247c01fbc…

MALICIOUS

PDF

36.2 KB Created: 2020-10-31 07:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 072ecd60e323e5be783cb812ab4d9255 SHA-1: 26a7be2f15f94a7f9f710dff2dd18b87b855441f SHA-256: 4c210c3247c01fbc9a7e8c8b58f8351e294570f7e4f7dc238dcf303ecd6a4edf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/123?keyword=darwin%2527s+natural+selection+chart+worksheet+answers+giraffe', is flagged as a malicious redirector. The document's content, though obfuscated, includes this URL and others, indicating an attempt to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.com/123?keyword=darwin%2527s+natural+selection+chart+worksheet+answers+giraffe In PDF document text
    • https://sewemojokevapu.weebly.com/uploads/1/3/4/4/134463988/mofituvuba_robelufi_leseraberamar.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/giguxilil.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/9245758cc14d5.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/1631302.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/4036ed46-f3c4-4594-9ca8-f3a7ff05c2f3/49683409668.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/23621119217.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/97513405289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d64118-4caf-4d1e-beb8-682cf1b36ec2/scoutmaster_conference_worksheet_tenderfoot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f92786-57e8-46c9-89a8-7ab21bd04fb0/47623863258.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/39601322655.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/speak_softly_love_classical_guitar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8985/2571/files/65870889374.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/nanulorewolenugulavosumi.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_off00004f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4C 5332 bytes
SHA-256: 7d825ccdd5f6dfef35b7ff1ec22a017aa51c60a80ac0359b4d0d8d0b2358b7cd
font_01_sfnt_off0000618c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618C 9892 bytes
SHA-256: 4cd9c6e71f466a04a6e27609f017c2183191d53e28d11b8baa77e4a4c4198fac

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