Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf008f7590db149…

MALICIOUS

PDF

45.7 KB Created: 2020-09-30 11:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 69426bfb0aae008554f7a111504a44fe SHA-1: 7f5d07261399d6edb404a2bde26db64b4a2dfcea SHA-256: ccf008f7590db149bb97a11f02b953f50b61b3309987b3c99f77eacf8b241a27
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that was also flagged as a malicious redirector.

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://cctraff.ru/strik?keyword=bruchrechnung+division+aufgaben+pdf In PDF document text
    • http://files.neo-hawaii.com/uploads/1/3/0/7/130739919/1cbcd77a.pdfIn PDF document text
    • http://pafubesel.alexandrahaleyart.com/uploads/1/3/0/8/130874679/2381894.pdfIn PDF document text
    • http://files.echohomeschoolextension.com/uploads/1/3/2/7/132740249/8ee926781c0.pdfIn PDF document text
    • http://ritixer.ravenstreasures.org/uploads/1/3/0/7/130775478/sosotabowaxegifago.pdfIn PDF document text
    • http://najeneli.karynwilliamson.com/uploads/1/3/2/7/132710589/6919724.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/0a638daa-457f-4acd-8783-175c471eed4c/74728127390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f420edd-f561-49f4-a778-1083f522b0e6/dezuxojuzus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a33977-e255-4c2b-95c6-995e2a38b8cc/10018141593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9109ee-1f65-4211-a9bb-cbcd30acf602/60449529764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e551e8d-e439-4308-af96-4a89ceabb951/39474631661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2119/files/barbituric_acid_derivatives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff22a32-d22d-468a-a5be-006f78fde238/55590370520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e247f28-d52d-4225-acef-e8271eb44cde/88267039917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3de9130-c89c-44d8-9ce4-a4f7cb7f9834/watogexijopunaraxexuvire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e4edb4-5508-4b84-928a-d4bc036c892e/14373332040.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0D 5632 bytes
SHA-256: 077f55efffd5cd95bf90b7d86ec58c24d7bd2b39c580853d7eb6f720d673d326
font_01_sfnt_off00006f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F37 11368 bytes
SHA-256: 33c63c788af5dc9661e6261ae63e817d29f031bb50df7f8c32eafc8a95ea5706
font_02_sfnt_off000094dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94DC 16088 bytes
SHA-256: 700ff7bf493bf9bab5e7bd19ce07725d6ad682c9ec1bd4c381fbd4d74ba1924a

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