Malicious PDF — malware analysis report

Static analysis result for SHA-256 705d4247c34fdd1c…

MALICIOUS

PDF

50.0 KB Created: 2020-07-16 12:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3067dd837f49f32bf456543b0c5007a SHA-1: 4a71536f17a67e9957e1f3db68e2de612b285ebc SHA-256: 705d4247c34fdd1c48c82aea67f0247ab0e23913981565c1d68eb39e548b69a3
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming. Notably, it links to a known malicious redirector at 'https://ttraff.ru/wb?keyword=que%20es%20un%20arrecife%20de%20coral%20pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to lure users to external, potentially harmful, 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/wb?keyword=que%20es%20un%20arrecife%20de%20coral%20pdf
    • http://files.kurskeducation.org/uploads/1/3/1/8/131856308/sebukazibi.pdf
    • http://files.vandegriftgolf.com/uploads/1/3/2/6/132682615/bitowusupexam.pdf
    • http://files.4pawsportraits.com/uploads/1/3/2/3/132302802/makirog.pdf
    • http://files.writercassmichaels.com/uploads/1/3/1/8/131856569/3974475.pdf
    • http://files.thealbertafloodroseproject.com/uploads/1/3/0/9/130969555/13cd00738d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jokurana.files.wordpress.com/2020/06/rosijaren.pdf
    • https://jiniluruja.files.wordpress.com/2020/07/rarugas.pdf
    • https://gulupux.files.wordpress.com/2020/07/jawubitize.pdf
    • https://bagesamajar.files.wordpress.com/2020/06/luseduwuworixejeg.pdf
    • https://sinezuve.files.wordpress.com/2020/06/repaw.pdf
    • https://gipumagu.files.wordpress.com/2020/07/fujukufi.pdf
    • https://xuvabogov.files.wordpress.com/2020/07/gogifixemufeb.pdf
    • https://gafazulitugo.files.wordpress.com/2020/07/26194649209.pdf
    • https://mitokoru.files.wordpress.com/2020/07/63038969179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3041/files/30439152160.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6942/files/61756034653.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/sazebew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pinabazebovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/majasufitomarejupafis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000825e.bin
d70322689ce47662e79210602930d0cd2bb0a13e42111219f441ae54ee92dbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825E 5012 bytes
font_01_sfnt_off00009369.bin
07d6cac96450213dc13a9552784438499c266056191feb1824c29d09ec0eaf8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9369 11628 bytes

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