Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47a3243f1875019…

MALICIOUS

PDF

48.3 KB Created: 2020-10-12 12:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8acb611774d53004192705c285d49bad SHA-1: de95f41d1180f42f4bc58cf302ed4ea4ce89e6ff SHA-256: d47a3243f18750198e9f894988a1f9153ebaf01e46668a6e0efb49c115f29c6f
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/pify?keyword=direct+comparison+test+examples+pdf. The document body itself contains obfuscated text and a reference to the same malicious URL, reinforcing the malicious intent. No scripts were extracted, but the embedded links and redirector heuristic strongly indicate a malicious campaign.

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/pify?keyword=direct+comparison+test+examples+pdf In PDF document text
    • http://files.kevinogrady.com/uploads/1/3/0/7/130739213/780a9096.pdfIn PDF document text
    • http://files.ver.enermotech.com/uploads/1/3/2/6/132682647/bc1f95887a45.pdfIn PDF document text
    • http://files.nzwfd.co.nz/uploads/1/3/0/9/130969652/c9ece39ba2.pdfIn PDF document text
    • http://files.viyanca.com/uploads/1/3/0/8/130814297/3789697.pdfIn PDF document text
    • http://lizevabof.katyschutte.co.uk/uploads/1/3/2/8/132814097/97906f548.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/93875744819.pdfIn PDF document text
    • https://site-1039132.mozfiles.com/files/1039132/mofudufodegudajasujidexoj.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/7ce57769-b821-4223-aa0c-fdc66592e257/vadekivafijazapiwexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae782bb-ca26-4cb3-8cc0-a3222b7b4fe8/kunigijelasesuxekuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219d775e-7515-460a-b41c-1858e3766c93/76351300856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/7875038741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9146/7163/files/cultural_studies_researchers_try_to_understand_how_the_mind_works.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4912/2972/files/farewell_speech_given_by_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6361/4369/files/23480818999.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_off00007d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D25 5368 bytes
SHA-256: 093373a2d7d768423e5e661bd80984981b1d530cb5375922e5222bd310e70f2f
font_01_sfnt_off00008f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4A 10804 bytes
SHA-256: a7077b5ec8c0a8a919ec58c8e174a982debc8599d2a0cb9ed82cb0e03380ae1d

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