Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89c213e30bc349d…

MALICIOUS

PDF

41.3 KB Created: 2020-10-26 11:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 001778505706a15617dd990315ae04b7 SHA-1: 982a9e2e9c3447f21a87cc58f122fdb0d5b56967 SHA-256: a89c213e30bc349d9e1dc84d83db722b297707d09d1dc7f241110ab54db98f1a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL 'https://ttraff.club/123?keyword=biore+nose+strips+instructions'. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on various platforms, suggesting a tactic to obscure the malicious destination. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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.club/123?keyword=biore+nose+strips+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5f9602b4ee1a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5f91bb576bd90.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/4abdc26250fc54.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/3703292.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/f96e2.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/zarib.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_5f947ab7b3eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8d699d2d410.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/16c91dee-60e4-4378-8d94-ec9cf08b51cf/43264645262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56161d5-aabe-4fce-99a2-f05e12d9e08b/51490434305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10756aec-8aca-41fe-9276-8fef03327e27/milizoxopagoroneribin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/99316372379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0055/1365/files/list_of_nouns_and_pronouns.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/likitawalom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0647/4419/files/26654816826.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_off0000635f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 4736 bytes
SHA-256: 223c37a5c58e0ba7f871769fc16e9752b14bbda690e246d399c0c385904c074f
font_01_sfnt_off00007389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7389 10832 bytes
SHA-256: 8517c56901dbdb2ed55ece98ea5af5d7b35586660c1dc0e5cccc69985b69037c

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