Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3e24ddb5351297…

MALICIOUS

PDF

44.5 KB Created: 2020-10-19 00:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0f12ac0e727f8c00502c9b2ccb42865 SHA-1: f079c672973dbca72b2c85376938a2415ca8aabf SHA-256: df3e24ddb5351297426f8bd5e4e3a9994efb464020925d35700c5c1c8192a76d
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 external PDF files hosted on strikinglycdn.com, forming a link farm. One of the primary links, however, directs to a known malicious redirector at `https://gettraff.ru/123?keyword=bye+bye+standby+bbsb4aw+instructions`. This suggests an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/123?keyword=bye+bye+standby+bbsb4aw+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f89556209031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f8ac259916aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f878243e9e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f8c1d535c138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/374f0e3f-5896-4f96-aada-75376af28c2b/90972752323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225d3e84-6d57-4c17-9a53-776f4d9b12c7/24814081231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d22681c-76ef-4078-9676-f90f15f0ca33/kiwukonujugofomud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7e671d-6ed5-4911-b452-802e3e7b9e88/84924454665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2154b3e-2fd6-4a40-b65b-41ad7544905f/zepowaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89644311-d9b4-4612-b665-4ef5ec5dbde0/lemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891d9123-d330-44a9-9640-efbcc7e54470/20951046011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8c788b-2df7-403e-90b2-e16d01ede92d/81884307328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5843/7530/files/suremugojase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/telecharger_dictionnaire_anglais_francais_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/waluzowipagumajadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4853e3-b9a1-457c-a62d-801514258f6e/86430680690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47d0c65-8c72-4223-a179-fdb13ec3a39a/duwewatazato.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_off00006ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBB 5372 bytes
SHA-256: cd4b1d03bafe812938e90661db63795ec3bb8cb430c142c3bc897eb13d83bc1a
font_01_sfnt_off00008123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8123 10596 bytes
SHA-256: 854d5c6405006960402fd4cb211f06aae1ab284706146711a573f8292a89433e

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