Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace1f618bfba1d82…

MALICIOUS

PDF

119.3 KB Created: 2020-11-01 21:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 432ea817892bcaf9411e4133e5a34fc4 SHA-1: 53532e89f756055cb2f85db183a74bb0bf068d03 SHA-256: ace1f618bfba1d820d69f66853d49d1a70b82c1c65e9db4ec957a8192f4dc9bf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to known malicious redirectors or disposable hosting. The primary malicious URL identified is https://ttraff.me/pify?keyword=tradewinds+charters+depoe+bay+fishing+report, which is likely used to funnel victims to further malicious content. The ML classifier strongly indicated maliciousness, supporting the link farm and redirector findings.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.me/pify?keyword=tradewinds+charters+depoe+bay+fishing+report In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5f9940c6653de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f90a6dac35c9.pdfIn PDF document text
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/kikugevuweguxosapoj.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/jujoxebixef.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/nokepuk.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/0faff7542dd1100.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/3bb0f9a1-ba49-43e7-bd4c-5a4cf9016a78/monohybrid_cross_worksheet_answer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/haier_portable_air_conditioner_manual_hpb08xcm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5054/8390/files/125_cup_to_fraction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/fomupeterejuzefez.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/50720370299.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_off00019665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19665 5668 bytes
SHA-256: 621abfc3ed0084d109e1c7c7c1be43c60374d326f61e5f8a00c5cc33e3aa9672
font_01_sfnt_off0001a9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C2 11252 bytes
SHA-256: b48f6f8514688a4b95fab5e3a918d09c54e05e7dcdd4b34c9f26687de3479e3c

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