Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf915a65991b997…

MALICIOUS

PDF

46.0 KB Created: 2020-10-26 00:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a699a03d1a11449f365344a8707ce31 SHA-1: 7970c907078c12d25c966fbcae544846e8a1028c SHA-256: dcf915a65991b9972d87291aa822f1146b834ec6e5f898239fef72215a91ba14
154 Risk Score

Malware Insights

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

The PDF document contains a lure related to medical guidelines, but the embedded link redirects to a known malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The document also contains a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, but the presence of embedded URLs and the malicious redirector indicate a phishing or redirection attack.

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.com/123?keyword=thalassemia+blood+transfusion+guidelines
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f8fb2223882d.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f903a60852b3.pdf
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/kusizajudolafunad.pdf
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/lobajiwewomixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leguvefu/rejoguvewov.pdf
    • https://s3.amazonaws.com/susonanezaj/monthly_budget_template_free.pdf
    • https://s3.amazonaws.com/sugaguxagu/47876961769.pdf
    • https://s3.amazonaws.com/purixifusipelid/vuviwepapotixof.pdf
    • https://s3.amazonaws.com/gopuze/islamic_name_meaning_in_urdu.pdf
    • https://uploads.strikinglycdn.com/files/7d3fdbf7-8f53-477b-8336-c0049908893a/a_history_of_world_societies_volume_2_since_1450.pdf
    • https://uploads.strikinglycdn.com/files/7e203c7f-6cf0-4234-93b3-bb0c98e07329/lotuvo.pdf
    • https://uploads.strikinglycdn.com/files/e0ab81e6-8205-4f4f-b3e5-2fb423a7fc97/1821514172.pdf
    • https://uploads.strikinglycdn.com/files/1ba8c0e7-1583-4a32-870e-5ca8ecb1c72a/writing_polynomial_equations_from_graphs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/36329214997.pdf
    • https://cdn.shopify.com/s/files/1/0506/3914/3062/files/lugiluluvetoxorerotinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6245/files/graphing_lines_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0439/0794/0520/files/street_law_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0266/8540/7421/files/a_thousand_miles_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0492/0079/1715/files/9191452201.pdf
    • https://cdn.shopify.com/s/files/1/0478/8905/5910/files/slugterra_slug_it_out_apk_mod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073fe.bin
34f1875e061546d4ff6384f946d54129508fc5c1123429747c43bd87e571255b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FE 5412 bytes
font_01_sfnt_off00008633.bin
fd5b2e9fb75af1e8284f708261083acf87cdc3a8bc58db8762977276f5693b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 10840 bytes

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