Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f11adfd6af61e29…

MALICIOUS

PDF

68.0 KB Created: 2020-08-05 04:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a886890812307f09d773d6722cbb69bf SHA-1: eed73726bb5013befdd96b48ccb74c9ea63a5b80 SHA-256: 7f11adfd6af61e296555aeeac51c9627a0b9c9f2454346c69a8d6a88816c930d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to create a link farm for SEO manipulation or to obscure malicious destinations. No scripts were extracted, but the presence of numerous links and the critical redirector firing suggest a phishing or redirection-based attack.

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.com/pify?keyword=the+rise+of+religious+fundamentalism+pdf
    • http://files.chandao.co.uk/uploads/1/3/1/8/131871449/jijed_fanipinixu_walodogujiwa.pdf
    • http://files.madelineislandmarathon.com/uploads/1/3/1/4/131453605/disatebiweje_fezabixuzela_vojuvaposofife.pdf
    • http://files.skylinehoney.com/uploads/1/3/1/3/131381374/cf266.pdf
    • http://files.sidleymountaincowboychurch.com/uploads/1/3/1/8/131871605/3637008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6027/8949/files/62362785143.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7116/files/misev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/gafopibimizoxujotebisuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/49014058939.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/79728940301.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/nubum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/78418937447.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/ligojomomub.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/57772316492.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/69932762025.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/dalili.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_off0000cc49.bin
79514993550afec0738d7d41d52ffaac3bc438e4a8bb82acc52955e52fedbaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 5404 bytes
font_01_sfnt_off0000de80.bin
6c963cfd59f4e319ba81ee99fcc9dcab304cad3dbe468cb4a744d026ae2a242b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 10688 bytes

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