Malicious PDF — malware analysis report

Static analysis result for SHA-256 8185b399047c6a1d…

MALICIOUS

PDF

54.1 KB Created: 2020-11-06 21:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: be98706a8477a18cd38c2d413e936477 SHA-1: 7643964775f9bfd0408bc06fa904e362f8ea9b71 SHA-256: 8185b399047c6a1d43bab8e0c3032f0453a7638255af927628d2a64cac4b1c6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links, one of which points to a known malicious redirector (traffking.ru). This suggests the document is designed to lure users to malicious websites. The ML classifier also strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent, likely for SEO poisoning or traffic redirection.

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://traffking.ru/123?keyword=winter+2020+fabfitfun In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/c692b000e7.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/ff2c6a55-569e-40f9-9282-a1a1e2045581/kuzokozenupupuwen.pdfIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb30f069-c4c5-40e0-8cca-62fffa1ea4e7/fedixaruri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b63a77-18e8-4b24-b3ae-07fe458cd80e/gakadiwunidopup.pdfIn PDF document text
    • https://fewumewola.files.wordpress.com/2020/11/catholic_school_girls_monologues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6385bc-a3b7-4163-8e8e-41af2490643b/93006806815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01c1ba0-2f35-4f5e-a82b-7249d002ff9b/91680387716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7ad31d-d4ad-4db7-8eb6-be29797c50da/53457214856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0283342c-e996-4df1-9157-75f4997c4c13/mapenosewuledalepi.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.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_off00007e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 4980 bytes
SHA-256: b7fdfea6132c297edecbd7027df8646c990e0d5db1955920e2e709120b551daf
font_01_sfnt_off00008f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1A 11460 bytes
SHA-256: a1161900077fe9577dfdab81190e3982ce8eb706551ff54a72625592a4beb09c
font_02_sfnt_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 16392 bytes
SHA-256: c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30

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