Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729e9e5d8838dc6…

MALICIOUS

PDF

44.7 KB Created: 2020-10-23 15:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 194ff8634e3c5b93aba002cff5c302ba SHA-1: 94af783514d047ad7fcdbe0cd4869efb1dfa3e13 SHA-256: 4729e9e5d8838dc6eea9fe2dde2cb3345a5634a94027f7e5dc47dc9d1eab27e2
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=diferencia+entre+bilirrubina+directa+e+indirecta+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f8d42e2ca022.pdfIn PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/e78606a0be.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/90efe50069.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/a12e72bd9.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nukunuraki.pdfIn PDF document text
    • https://suleduzon.weebly.com/uploads/1/3/4/4/134403341/kizolumopigak.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/7360541.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/sexokijaxelatidozo.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/7096049.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/0d5dafb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/70868284700.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fizewipola.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/41772337651.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/thinkertoys_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/rusilomen.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wojutatafowevuze.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/arthur_schopenhauer_kitaplar_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/43320644255.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/vavoropoworagumaf.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/budget_2018_india.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_off00006a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A41 5112 bytes
SHA-256: deca5f83bc14e8b64523a783d53dc064f3c6c8876da7f08ceb58ae35c3b423b0
font_01_sfnt_off00007bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 12044 bytes
SHA-256: 33b41ea598c4c8f6189d878a6607a44b9c94b1f02aad593d3b243768fdf720d1

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