Malicious PDF — malware analysis report

Static analysis result for SHA-256 df249df9d44f3f36…

MALICIOUS

PDF

38.0 KB Created: 2020-07-18 02:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 3e21891dbd4e78545b69064977bf86f1 SHA-1: 51910b98caeed290d68a3497e35f10e17d310c4b SHA-256: df249df9d44f3f3608a39a8a43a6929d748e35d1cd47aa891e6d98a7880e1caa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains text suggesting it is a manual for 'Rdworks v8', likely a lure to encourage clicks on the embedded malicious URL. The file also contains a large number of embedded links, many pointing to WordPress sites, which is characteristic of SEO link farm techniques used to obscure malicious destinations.

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.com/wb?keyword=rdworks%20v8%20manual In PDF document text
    • http://files.monarchgard.com/uploads/1/3/2/8/132814942/4318787.pdfIn PDF document text
    • http://files.csnobcs.org/uploads/1/3/1/4/131452806/c9c3257b.pdfIn PDF document text
    • http://files.eileenenwrighthodgetts.com/uploads/1/3/1/8/131857476/vefosojexuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lakezusegaza.files.wordpress.com/2020/07/musavij.pdfIn PDF document text
    • https://keligorages.files.wordpress.com/2020/07/70891159602.pdfIn PDF document text
    • https://gijoponalip.files.wordpress.com/2020/06/30989002467.pdfIn PDF document text
    • https://lezuvovefoga.files.wordpress.com/2020/06/40139907333.pdfIn PDF document text
    • https://fububoxoludi.files.wordpress.com/2020/06/57635497726.pdfIn PDF document text
    • https://morixumudiba.files.wordpress.com/2020/06/10201362900.pdfIn PDF document text
    • https://nebosevali.files.wordpress.com/2020/07/joneletukafij.pdfIn PDF document text
    • https://nifefuv.files.wordpress.com/2020/07/49889369361.pdfIn PDF document text
    • https://xuridugeduna.files.wordpress.com/2020/07/vojam.pdfIn PDF document text
    • https://sokoxoxuze49931159.files.wordpress.com/2020/07/9348549723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/vamuvupefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/54383715566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/75880660380.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/kitekutenabuparad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/digadetij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.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_off000059a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59A4 5024 bytes
SHA-256: 04eb325cd7b214dae55f0b5b9885acb70ef01045e9b72020d65c9974cddd2976
font_01_sfnt_off00006aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA0 9428 bytes
SHA-256: 07df591c986b260676badd40d3cfd453b9505e520063540917715fd6d1ad6181