Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2333acb78a1c14…

MALICIOUS

PDF

52.3 KB Created: 2020-10-04 07:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f1a2dd68769652145e781dc691e87f8 SHA-1: a56886c64127b8fcf22490c38c560ea663ac87e1 SHA-256: 8e2333acb78a1c148b8c0b2dd228314d0598c049ef987d4e9e525d0069397138
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and SEO link farms. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to drive traffic to malicious sites. The ML classifier 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://ttraff.link/pify?keyword=nordictrack+a2250+for+sale+used In PDF document text
    • http://files.serenitycounseling-wellness.com/uploads/1/3/0/8/130874329/minebaluxuj-berixamis-weturiw.pdfIn PDF document text
    • http://files.open-insurrection.com/uploads/1/3/1/0/131070612/7216517.pdfIn PDF document text
    • http://files.carafegeorgetown.com/uploads/1/3/2/8/132814624/tewevewuzobatonulitu.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/953f8df0-e450-4c1a-bb97-fefc6cc28639/siruwuvadikofutaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c135c687-2a7d-485c-8e8d-1a66e8efc335/74174901145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcd27f3-308e-48ea-9472-2a147428cefc/vofamujosij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c303517-602b-4133-aecf-eec34f8f1388/nubijasunejixeboxenobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ff37d6-5526-464e-9a2a-00d959465479/gametirokekujibenupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcce431-5470-4f77-ba88-d430e8dadc20/debijukubodufob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1855/4010/files/gugasapujesekogumelarara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/15751963428.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_off00008e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6E 5444 bytes
SHA-256: 26a7e9af35cdb6ee9d6028924d29e5e91344da59585735a4e85d9fdbddb7b8ea
font_01_sfnt_off0000a10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA10C 10380 bytes
SHA-256: 07d0c9bae5d6e72240a354a6ba74d4fb0f22a8f215a994ccdc1c2a781810c59d

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