Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d409435ba69b7d…

MALICIOUS

PDF

96.2 KB Created: 2020-10-27 04:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 07f5edea34b4cbb3653c0e919902cbf6 SHA-1: d2f5463451cdc22557c8458c796c03926855a44c SHA-256: 23d409435ba69b7d0a9d15e27d4bf1fc1692316d08f3690bd5bcd0f87779733d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to the Basilica de San Pedro and the malicious URL, suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document.

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=basilica+de+san+pedro+vaticano In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5f914fe5c7447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f9751d0c4f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f873d5f2bce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f9610ba76ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8be5796acf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5f8d879e7f7df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f90d700c5df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_5f91864e7eb56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4525/2003/files/wubegutezus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9931/5118/files/tegura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0124/2015/files/how_to_install_savegame_manager_gx.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8494/6850/files/osteoporosis_guideline__2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452e7208-1f32-4343-a00d-9d4a16b16847/jutitaravodufonudumesop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7df7d1d-b6ee-45cf-a0fd-202218f572c4/7501407755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e25092-5ec6-4e79-a491-04d1ba794566/17996532693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005f87dd-4441-446e-8e2a-6b5827e4188f/classical_guitar_practice_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947101cd-ec9c-4dba-8ecb-52a617aecfcc/ejercicios_complementarios_5to_grado_bloque_4_respuestas_formacion_cye.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/mathematics_for_finance_business_and_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/biochemical_tests_for_identification_of_gram_positive_bacteria.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_off00013d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 5176 bytes
SHA-256: f835d40288e84abcd4e790410f5703f858ab697c530c687407ad56db597d627b
font_01_sfnt_off00014f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1E 10476 bytes
SHA-256: 6541c132092872025c270d3bb0e830a3c70d71298bc970103f7199d4761d3f18

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