Malicious PDF — malware analysis report

Static analysis result for SHA-256 501fe25ac5864883…

MALICIOUS

PDF

54.4 KB Created: 2020-11-05 18:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f2afef7b01b6cfbabd2cc297f8fa032f SHA-1: 71fd20caaaa8b177bbe5d4e185e77fef36514741 SHA-256: 501fe25ac586488339547c688dafb9ee6ccab95656cdaa890f5c312e5b4b27d2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute further malicious PDFs. One of the primary links directs to a known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of 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://ggtraff.ru/123?keyword=rwby+beacon+nurse In PDF document text
    • https://wejigawavopon.weebly.com/uploads/1/3/4/3/134305277/jijorapop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f8d35a9b2e76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xebuvuwov/gedomis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126c180d-292c-42b1-ba71-cceb0c54ea6e/examen_de_ortografia_y_redaccion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e6830d-a7c1-4df0-8158-5d80f59f4bbd/probability_pitman_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/rev_it_up_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/spoken_english_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/punabuwizutivijiregevigov.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/vtech_kidijamz_studio_target.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/sweetbitter_stephanie_danler_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/cours_d_anglais_niveau_debutant.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/polar_sheet_sets.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/21458341157.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CF 4856 bytes
SHA-256: d8d2d26ccd420fc0d788eb03ff49b50980ea7aa11251c3c0e8089a1d6e2fa007
font_01_sfnt_off00009a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A63 10656 bytes
SHA-256: fbe638230dbc37cacbb2fe4012f1be1814a4f299733894b6d0f704ef6ceec374
font_02_sfnt_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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