Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66831125af32a37…

MALICIOUS

PDF

77.3 KB Created: 2020-11-09 10:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8bf780bd8a78bed292406df05562820a SHA-1: 9abed1e623d2f72ddf6166760b7d18d6ddb45aa0 SHA-256: d66831125af32a37daff4c8b1e26d60898d386e33e213291e025af54514f4fff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://trafftec.ru/aws?keyword=rhapsody+puppet+guide', is embedded within the document body, indicating a potential lure to external content. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious intent, likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=rhapsody+puppet+guide PDF link annotation
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/kotojujakugak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f8a063ef25a1.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/loxotudo.pdfIn PDF document text
    • https://titamifafipife.weebly.com/uploads/1/3/4/3/134315234/tumuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_5f99c5c884195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rebimakufiw.files.wordpress.com/2020/11/my_hero_academia_the_movie_english_dub_google_docs.pdfIn PDF document text
    • https://bopugixuja.files.wordpress.com/2020/11/gifinesawixedupe.pdfIn PDF document text
    • https://zufavenasefu.files.wordpress.com/2020/11/godezatafokunojeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f367acab-6fc5-4f69-813f-1617c59e270f/extreme_s_8g_helicopter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5a6356-996c-4dc2-9c44-b537a0e4c79f/nuredosupupopolitalo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 3084 bytes
SHA-256: 7664eba304adf8342a7ac3c99548211fb0892f878c24e12304b479c49b44572a
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5200 bytes
SHA-256: 0ef07042d7bbc7740f67337cb7aa3e1910f4d60d36bc3521a1ff4332a452fe0b
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 13388 bytes
SHA-256: 83580361af99fa261f5d02e678efc8ae6b817f18546174d3bc5feb2670fa33f8

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