Malicious PDF — malware analysis report

Static analysis result for SHA-256 670b78490b748cf8…

MALICIOUS

PDF

36.4 KB Created: 2020-10-31 00:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d41be28739922aeb84d7e5e66af8759a SHA-1: 9e4f60014c22670b4318f387225e5511f6cf1f7f SHA-256: 670b78490b748cf86b45dc5f8f63d955cafb176ea0aa217f1ab3aa017244f65d
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 critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/123?keyword=accelerated+reader+zpd+chart'. It also exhibits characteristics of a PDF link farm, with numerous external links. The presence of a 'download button' lure further supports the malicious intent. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or redirection attempt.

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.ru/123?keyword=accelerated+reader+zpd+chart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8ae743a0f62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5f8f5bd10cc21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f8b75c15e4fa.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/xupatovarowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f875e4a18cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_5f9ac65dcde78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8d7fd9d662a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_5f97b9dc4f1d2.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/1/0435/4532/9832/files/zumedewagezidasog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6867/6038/files/55286789896.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/ponoriwigem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1109/9800/files/chemistry_lab_equipment_list_and_pictures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9456/5798/files/acupuncture_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/3947/0780/files/stoichiometry_lab_vinegar_and_baking_soda_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/80900292883.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/maxwell_x_factor_keto_reviews.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_off000051e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51E9 5024 bytes
SHA-256: 706c9217a92b415dd6c6a7c6b3bf032191f8eb0e6feb5000ae320abcccf69fe4
font_01_sfnt_off000062fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FE 9936 bytes
SHA-256: fa80fd7377248e57cdac15e54fac5a12a6258a900f5046821ba05bad68938af5

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