Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f014e9104b6231…

MALICIOUS

PDF

56.9 KB Created: 2020-10-28 05:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6b5a7548052ca7fdbbffd7ef0e4b3b7d SHA-1: ae980691981b48dd9872e62ff7bfd2548ef82be1 SHA-256: 82f014e9104b62313b7f32ad3b85cebe11144a3cfdb1be697bff7b213c00d740
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or to redirect users to malicious content. One of the embedded links, 'https://ttraff.cc/123?keyword=sketching+tutorial+pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive document content and malicious links.

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.cc/123?keyword=sketching+tutorial+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f86fedf353e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5f97690475a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5f982cffe3539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f89e1f3c4b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f987e3225da5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f8eb93acce09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f904a8d96d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f874f175989c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f9355723f2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8fc796dfa24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f983b8c99383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8aa6e68d5d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5f8e0c8447a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8a0687e58ab.pdfIn PDF document text
    • https://zaroxirag.weebly.com/uploads/1/3/4/4/134457582/4428376.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/mobililefevi-dimobozijelage-rojokorisirek-bevariwegonime.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/kodikeb_tasodisovovefe_fevajenegaweje.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/ab6bf.pdfIn PDF document text
    • https://pakezumada.weebly.com/uploads/1/3/4/3/134368128/8107355.pdfIn PDF document text
    • https://basuxebuj.weebly.com/uploads/1/3/1/3/131379820/bepojibatow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/rorirobini.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/34896228037.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/balboa_theater_seating_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/sewesugipavafob.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/asciidoctor-_footer_header.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_off00009c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0A 5408 bytes
SHA-256: f1eeb84e0d8c9276407a694dee2a9de9eb0d17f7179cc080c7c3aa83246993f0
font_01_sfnt_off0000ae62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE62 11656 bytes
SHA-256: 039c7d065f330ac7b794c9e552acb3144d13f099ecceb8ba118776e2d3cd7424