Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bfcd6b1d4c75b8…

MALICIOUS

PDF

34.3 KB Created: 2020-10-30 09:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fc1098057b71a5e6e49fe65f9751b01c SHA-1: 33cc4fabde2cb8cd76bccbb690dbd0a37fcd6a1b SHA-256: 71bfcd6b1d4c75b80ab744c3e1db360fe5b07e5069aad445b206cdf30b0c066a
124 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting it is a manual, likely a lure to encourage clicking the malicious URL. No scripts were extracted, but the presence of multiple links to potentially disposable hosting suggests a link farm used for traffic redirection or phishing.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=magic+chef+over+the+range+microwave+manual In PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/rurexefiz-noginapajeg-bimowinosiruga-tewozisowesi.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/polukebevivez_pazuxizijixes_musomusuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8e40af3f933.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/a3dff3e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f92554b878b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f9bbbc46a0f0.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/tuzom.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/84995278b2dc.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/1305204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f9b1d19b1a80.pdfIn PDF document text
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/gebekodixe.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/f6e6cdbf9f.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/leguvefu/accelerated_mobile_pages_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/16400923476.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_off0000481b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x481B 5276 bytes
SHA-256: 9c17b46de4b4e532cdd03b53dd6e8a3c367eb964de9383cf71ae0ef8b7eb5c2a
font_01_sfnt_off00005a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0C 10224 bytes
SHA-256: e90c1955364257ccf6a776a8a0aa3f0f7c477bee4d1c03a11a4dfabef68bcd89

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