Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ab0eb25cf6365d…

MALICIOUS

PDF

43.3 KB Created: 2020-10-02 22:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 64e6fa05224e1887895fcb479c09f9c4 SHA-1: e8e3b4b3c6f2a24f3544858a38ce55e412f4e9dd SHA-256: c3ab0eb25cf6365ddda03ecd397d3ee460d33839cb1bea195c9a76543379b4fa
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains text and URLs that suggest an attempt to disguise malicious links as legitimate content, likely for SEO poisoning 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://ggtraff.ru/strik?keyword=benjamin+bloom+biography+pdf In PDF document text
    • http://files.oursouldoors.com/uploads/1/3/0/7/130776118/0f964f1.pdfIn PDF document text
    • http://moxuf.rosecityfolkschool.com/uploads/1/3/1/4/131407537/6872575.pdfIn PDF document text
    • http://bikomonew.sonicblessings.com/uploads/1/3/2/6/132683165/4563892.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/32250000581.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/wujapa.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/344f6aaf-a13f-4cc3-9185-ae1358992cfd/6114837974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f9ce72-735b-4f71-af25-1f0e9136f61e/32595681767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54a3b5a-6c4c-49c3-9b96-aedd2258e918/munukewetupirifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66ec95d-f971-44c6-802b-68bc611248a7/60368994303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3755d5b-186f-4ebb-95c2-ca069330f421/rujolupugeloromekuvov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2701998d-2ba2-4f58-8f75-c2f60036c440/70491004837.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_off00006406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6406 5644 bytes
SHA-256: 93afd68e828bea0d7fa865265589a2d19cf1a692d5d3b6fb0b0e28c3ed684850
font_01_sfnt_off00007718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7718 12200 bytes
SHA-256: 4b6de743e368873963b637470988e8e61068f6bf63a16493fdfdd342de5577ac

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