Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8de684e0189a12…

MALICIOUS

PDF

53.3 KB Created: 2020-10-20 20:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3bfd6f9c9ff778ba0cc90c0c53f02446 SHA-1: 4068e70edae71b915da421997671f155f944ffcd SHA-256: 7f8de684e0189a12e2a5cecca3c988c57696d4d139bddc72878c18f12c7768ef
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services, designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.link/123?keyword=concierto+de+aranjuez+trompeta+pdf`. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a link farm or SEO poisoning campaign to drive traffic to malicious sites.

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.
  • 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.link/123?keyword=concierto+de+aranjuez+trompeta+pdf In PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/xurujemibogapak.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/4d44ae4b1223af.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/5396483.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/5587299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f870e3f95294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f8a56bce35cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f8b64c44572b.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kezupukono.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/e1caba7c4f4040e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f88887f1d2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8de98382f8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8e2a1a7dd65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f8a63416f6f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f87f2e3591c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8e2e7813782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f8916c766f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8b82d4ac272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f8c3e9a0e2e8.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/1/0500/6488/3903/files/labio_leporino_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6940/2009/files/plessy_vs.ferguson_timeline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9639/0814/files/wilunazerupadijopi.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_off00008f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3A 5124 bytes
SHA-256: 8b88e598b3ff30b695779694f92d669a618c499dd018818cdd2f3eaa098caf73
font_01_sfnt_off0000a099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA099 11616 bytes
SHA-256: 197a293110dde8dd6c4da7c28832c51b4d6950c2054e342c08072036153fe48b