Malicious PDF — malware analysis report

Static analysis result for SHA-256 9effd655cd66538a…

MALICIOUS

PDF

75.0 KB Created: 2020-11-17 00:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5b8bc9e8040e175a4b3d30ce9411ca47 SHA-1: 7dd5a57d9b1a373da6bb0793840570ebb4174427 SHA-256: 9effd655cd66538a269d962c08e5885545ca07bf74e3e40683f9a090f21c0509
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 external PDF files, indicating a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=exercice+type+bac+nombres+complexes+corrig%25C3%25A9 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f89d08a300e1.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/8423242.pdfIn PDF document text
    • https://jenevokitajawol.weebly.com/uploads/1/3/4/2/134235402/a89d2e62cb6abf.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/867734.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/493898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466664/normal_5fa4be0265c09.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://uploads.strikinglycdn.com/files/92f30dfa-35d2-4cc7-8e53-3f9bef103f17/el_abecedario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fc5ea3-320d-4d02-b99f-572e79785c93/pivoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d191e3-c7d8-4dbe-becd-2ad4dff25c7b/22782188669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bd2328-7660-4f62-b484-53277d39bb1d/detulipeboze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d609dd-cb7f-484e-a937-3b26cd531498/team_strike_force_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea96cf2f-8d50-4972-a0ff-ba4e1ada221b/mimufuraxemefimeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cbe140-ee6d-4ff7-b949-b485fe182198/yusuke_persona_5_confidant_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab040a1-9837-499f-a29a-729555060b4e/zewibi.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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 5452 bytes
SHA-256: 5666202f11a664f32c8909cc402415680687aad9d0232f8f1f5013c6549506a1
font_01_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 17268 bytes
SHA-256: 0e9dbb8e25612060c835c2b71376350e35faa0b51cacdb9df5d532bd3e030b16
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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