Malicious PDF — malware analysis report

Static analysis result for SHA-256 234bf0b13dbf400e…

MALICIOUS

PDF

110.6 KB Created: 2020-10-29 16:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3ddb0c73722a7c78d7d2dc61a3efe26d SHA-1: a79fd55d10e63512b9e95f60a16ac500ba8cb226 SHA-256: 234bf0b13dbf400e9969acb0be3c785b9ea52660137a17019f826b72050b7a03
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/123?keyword=%25EC%259D%25B4+%25EB%25A9%258B%25EC%25A7%2584+%25EC%2584%25B8%25EA%25B3%2584%25EC%2597%2590+%25EC%25B6%2595%25EB%25B3%25B5%25EC%259D%2584+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5f9a7e2e94164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f89b44a641d2.pdfIn PDF document text
    • https://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/026654ef27.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/04fea1d7-2ca1-461f-b0c1-aa7882e7f066/wuzijokarorisuzaxopidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afd4c22-4013-4d0b-a633-81114bac3ce1/xifokovefalinafaxekux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2d92eb7-135a-493e-a527-4c63befbe725/27945994712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1697c558-c6d4-4c31-83f6-04465680ce2d/ganevevekolag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e683e520-23d3-4948-b0ee-969c0916274b/gubejizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e8e00d-20da-4277-8194-ac2a18985673/39921117808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239c59fa-07d0-4005-a22f-7923a948eb3d/botofevuga.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/3208057184.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/viva_la_musica_andres_caicedo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96DA 74308 bytes
SHA-256: d0e6fc66e3bcc60f61fac7d3079a448ae7cb914f29967abe5c46f347babd9c79
font_01_sfnt_off0001587d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587D 4084 bytes
SHA-256: 49aa5abfa1ea40c36ec3c42b429f5a7fd98df3ab2ad9db1e3c901db96fed2be4
font_02_sfnt_off000166f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F3 4424 bytes
SHA-256: ab90e9b93aefc0d1f798e8f30b39548ef848779d852fa3bb7cbb115286381d84
font_03_sfnt_off00017614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17614 8788 bytes
SHA-256: 9880e96674719fd7a5ecaa80ffcdcbd21701fb276e5fcfa914bf29673c4da8ba
font_04_sfnt_off00019465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19465 16380 bytes
SHA-256: 2e1dcfa215ff7068e156f9bca6f25e666cb310e753e20272ef9c89573ef626fa

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