Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b50667e09d1b8ee…

MALICIOUS

PDF

56.3 KB Created: 2020-10-25 18:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cc18156e51c09c3235cc650e451cdd8 SHA-1: c7fdefa698c047a4b4207db2d2a4ce6dc86d9d5f SHA-256: 5b50667e09d1b8eecae819b65590a8fe60c07a11ed51f854e7cc6de523648394
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely intended to redirect users to malicious sites, potentially for SEO spam or phishing campaigns.

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://cctraff.ru/aws?keyword=enc%25C3%25A9phalite+west+nile+pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f8a7946d624b.pdf
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f8ffc205db8c.pdf
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f87dc38d0186.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/67e0e758.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/f4698b929c3963.pdf
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/2965940.pdf
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/repexazamixofov.pdf
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/gasiluw.pdf
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/c107d04e.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/kewoxisibe_vukuvirezikopat_zupite_xuguna.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/9225f5590a2.pdf
    • https://kagadema.weebly.com/uploads/1/3/4/4/134456650/gejosawugok.pdf
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/wekuzixevi.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8ec00da6f3f.pdf
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5f910f5eaed2f.pdf
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f89c9d8dfa25.pdf
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f92c3929c5a2.pdf
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/b4502b2b8a19a6f.pdf
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/689241.pdf
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/646693.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aff.bin
284ef2f2f12fa5b566d2889b9f053e01ba2322f7503ed704d0a499c6268e49f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 5340 bytes
font_01_sfnt_off00008cec.bin
61a543acdb6f0a7bd067651a422a493d166d0cf94217f1c4c92324cc7717bbda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEC 15552 bytes
font_02_sfnt_off0000bcc0.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC0 16204 bytes

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