Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a917d58e89092d…

MALICIOUS

PDF

39.4 KB Created: 2020-11-03 06:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9e9f715bd43fa1fe51bdfb5a95b1163a SHA-1: 375f2258fd4389d39a5954117b5397bbc6ae1e46 SHA-256: e8a917d58e89092d68decc9131d78c5dc91eff2c7a5a6e3edd5573029fb50725
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 critical heuristics identifying it as a redirector and a link farm. The primary malicious link directs to 'ttraff.ru', which is flagged as malicious infrastructure. The document body, though partially garbled, contains text related to 'answers to 40x escape level 35' and the authoring application 'wkhtmltopdf', suggesting a lure document. The presence of many Weebly links indicates a coordinated effort to host malicious content.

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.ru/123?keyword=answers+to+40x+escape+level+35 In PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/3590787.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/6366cb5c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5f9674a99f4b1.pdfIn PDF document text
    • https://xamalebudeke.weebly.com/uploads/1/3/4/3/134326767/5259456.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/6317.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/lisezawex-pagiri-xupanowusumobap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f9017b540ff2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5863/8229/files/diagrama_de_pareto_en_minitab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4397/7888/files/sebi_lodr_regulations_updated.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/6700383587.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/nofitoserorafe.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/bilingual_education_books.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/vidamusoxexujetumimu.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_off00005a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A91 5652 bytes
SHA-256: 631f60df3ba9295c0c01a6f24534c81a9723a4c4d8b043113cdcf78fda8e5cfe
font_01_sfnt_off00006e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E04 10192 bytes
SHA-256: 0fc7513de87e0320d1d0102d4dcbb6098ffee411a6098335aeec0c07e519997f

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