Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e3e59c9deb3ac…

MALICIOUS

PDF

55.2 KB Created: 2020-11-07 07:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c626339664467b5fb2e64db658e29c3c SHA-1: e34ac83bb70265e08acdc41bc4a2eaa2773d2029 SHA-256: ae5e3e59c9deb3acf339cfe66c299f0ec04811ef1b4e1304af7170fbfdb3750e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm, with one prominent URL pointing to 'trafffe.ru'. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for SEO manipulation or to serve as a lure for further malicious activity. The ML classifier strongly indicates maliciousness, and the presence of numerous external links supports a malicious intent.

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://trafffe.ru/123?keyword=national+softball+association+logo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f8d10b7b6a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f97355320801.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/betokojinixanuwirana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://saxofenofam.files.wordpress.com/2020/11/cellsentials_usana_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37253d37-1868-4e4b-bf2d-c2a6838e749a/633592509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1c3094-8006-4e0f-80a6-180019b1d4c0/75713926690.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f93bafb-c0a0-4444-b1cc-b57052f5a504/62348743159.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/772532505.pdfIn PDF document text
    • https://semumawi.files.wordpress.com/2020/11/8950735449.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://pazujuruki.files.wordpress.com/2020/11/7654946500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8132de60-8fa8-4f53-8542-2f08d16da40a/nook_usb_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/chopin_ballade_in_g_minor_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad2e2d7-6b2a-4524-a7b4-a30e2b988713/pidadiziderekaxebapiw.pdfIn PDF document text
    • https://talonusutax.files.wordpress.com/2020/11/gojuxef.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_off000094ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FF 5060 bytes
SHA-256: 44018df008f4fb57d07feb400d45ba21868830ee20d158662cee69cf666cea1f
font_01_sfnt_off0000a659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA659 12204 bytes
SHA-256: 066af2ca629a8773c821a6f560c2ca5d0e588e8f69e4d3aa99520c224726c3a6

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