Malicious PDF — malware analysis report

Static analysis result for SHA-256 646f20bf8fc49fd8…

MALICIOUS

PDF

42.4 KB Created: 2020-11-05 20:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c948ffc588b2043bb53cdf9cb680ab50 SHA-1: 8bec251731e51f87c5ae6915a4e08bd5a213d1d3 SHA-256: 646f20bf8fc49fd87298786687c26216c2aeac2ec767113cc5556129a6982199
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 one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/123?keyword=big+head+foot', which is likely intended to lead the user to a malicious site. The presence of numerous external links suggests a link farm or SEO poisoning attempt.

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://gettraff.ru/123?keyword=big+head+foot In PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/ligubod_sisulile_rugofit_tenavadefewuke.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/712666.pdfIn PDF document text
    • https://zorimogitew.weebly.com/uploads/1/3/4/4/134487520/wasiluwuxubetok-biromume.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/0a8861bc1.pdfIn PDF document text
    • https://mokogexikimowo.weebly.com/uploads/1/3/4/3/134321985/2549578.pdfIn PDF document text
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/3e6649df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/hr_interview_questions_and_answers_for_fresher_candidates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/64227999522.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/52215046884.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/holmes_stand_fan_with_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/walter_lewin_lectures.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/fort_wayne_community_schools_address_lookup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff742712-331b-4880-92c0-5a6149446f1f/cambridge_checkpoint_science_workboo.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_off000069ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69EF 4912 bytes
SHA-256: 540a120c14190ee2ab3541d2d08b9ac84683d7787185c2b246a8acca4305f308
font_01_sfnt_off00007aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 10096 bytes
SHA-256: 44fd7805d1d47f75b583dc86118307547deba8c73146c658db2c65c7db818d8c

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