Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d84feba8f344e2…

MALICIOUS

PDF

35.1 KB Created: 2020-10-26 11:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0314faac745df1025729ce05e783bd4e SHA-1: 899d2cf25c06ce53da7ea1151a97402ec432da4d SHA-256: 51d84feba8f344e29da28018505b8b2e6d26d7a2d2f1310885df4502fa3c5260
162 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a redirector service. The primary malicious URL identified is a redirector that uses a keyword-stuffed URL, likely for SEO poisoning to lure users into downloading malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/123?keyword=aircraft+accident+investigation+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f93c6457f714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5f964cbcee601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f9516135a9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f91cb54df52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f8bd786e3ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f90b15ee7242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5f966c9f3f10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f8df53d810ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f8c18a302112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4489/5392/files/download_root_genius_apk_ver_1.8.7.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/52368575612.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/65790967608.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/microsoft_certification_exam_path.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/dudekitoluxe.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/83433449070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/90753298920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3624/4643/files/15g_form_fill_up_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1700/7014/files/71906767165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7375/7876/files/18799133246.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_off00004c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0E 5544 bytes
SHA-256: c98242f462e564bb584e49c1e71a607ed5107f5220f9511759bf37334e201ecb
font_01_sfnt_off00005ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF3 9488 bytes
SHA-256: 1ca1fe94ac2ab0f2bd9895fa52a6b04a48fe0912717ab63958f92b94d8c98d9f

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