Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebd3925d798cce5…

MALICIOUS

PDF

45.2 KB Created: 2020-07-21 07:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3335a099dee4bb7f588a0e233229fafe SHA-1: d20751c14badf3e2ebdc4e01915eeef6038e3685 SHA-256: 6ebd3925d798cce5a9197d5126c09e53319c17d0b9ff789592f6e570c5559336
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to what appears to be a link farm designed to manipulate search engine results. One prominent link directs to a known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the document's structure suggests it's intended to lure users to 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/wb?keyword=homework%20sheet%20template%20pdf
    • http://files.alpinecivicclubboard.com/uploads/1/3/0/8/130813524/2314108.pdf
    • http://files.annakubitz.com/uploads/1/3/1/6/131606743/dikejuto-femoke-gapakebenizax-savifida.pdf
    • http://files.scarletvalleylogistics.com/uploads/1/3/0/7/130739173/tavowan.pdf
    • http://files.sambeafarm.com/uploads/1/3/0/7/130739628/b35986ef45730.pdf
    • http://files.rivervalleyartistsguildofportjervis.com/uploads/1/3/0/9/130969089/budeno-tazepuvevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6007/5427/files/2280481183.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/77882565689.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/53533742268.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/wawirafor.pdf
    • https://sesuxegu.files.wordpress.com/2020/07/13488858180.pdf
    • https://zugebopiw.files.wordpress.com/2020/07/44959484725.pdf
    • https://kafabumifo.files.wordpress.com/2020/07/ninunasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/madiravisokesapopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/73855570027.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/nomazokugas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/keduzewofaxewisubejida.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/juvajubovemesukaputupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/88288775270.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/25018316306.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/temezufexazufivusob.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_off000072e2.bin
2d7c0fe78da3918dcc689fbe83a04354608ae7a8c321bd8e10dce3bdcc17f990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E2 5032 bytes
font_01_sfnt_off00008410.bin
6042ccb1236870a14668e7ee74b5f3b507c8efe48e95bb2f0f0ff4c7ee6da50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8410 10412 bytes

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