Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6de3abf4bf5572c…

MALICIOUS

PDF

50.8 KB Created: 2020-10-28 12:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 645d28dd41c406825def11d6acf844e0 SHA-1: 33c1100ed6b7d25c6f13b391b334bb792bb5a3a1 SHA-256: a6de3abf4bf5572c2eafcbae9d26d67ca2f99398c581b510500e20e166a229df
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and text that direct users to a malicious redirector URL, likely as part of a phishing or scam campaign. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host numerous external links, potentially for SEO manipulation or to distribute further malicious content.

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://cctraff.ru/strik?keyword=9+times+tables+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f8b9db858d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5f9080ca162c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5f939404c7eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f993da5f3ea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5f8c2304774a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f973fcbc9b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8e7ff3445d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5f970cb636cee.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/1/0437/6818/4994/files/colour_mixing_chart_for_watercolours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb9ce31-9c36-4f2b-b4bd-e1f938a261d0/juregufetipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0688/1702/files/vw_amarok_2020_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5268/5720/files/61506788081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6122/2307/files/wrestling_revolution_mod_android_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6780/8190/files/ajustes_y_tolerancias_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df887e10-b254-4c3c-9b43-bb4b1529d54d/wadozukofulobugirexabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee66cba0-317d-4170-8b88-611c2ee3e6d3/oh_susanna_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6860/7649/files/wish_you_were_here_tab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0876/4321/files/itouch_smart_watch_3260_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe1e820-baf3-4dfd-b6ff-e5c4bc40195e/xivimafuv.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_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 5112 bytes
SHA-256: 9c212cc7b70f36899cc117d0baf92e89a1e8795c01222fc6d35182355b395332
font_01_sfnt_off00009b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9F 9968 bytes
SHA-256: af9a4b44f2f8bcfc3f876d7066b4362122ec0f3a462b94d281c6562fcad96f7c

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