Malicious PDF — malware analysis report

Static analysis result for SHA-256 66241cd2f38de3a2…

MALICIOUS

PDF

43.4 KB Created: 2020-11-08 18:26:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39782b5645c7d11ec3c43d2a7ac64fde SHA-1: d69980f3034a2d2566c5049400846cc1b31503b5 SHA-256: 66241cd2f38de3a262dda50e06edc935c9b871630d6c88fe920b84d0d69a1842
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic. The primary URL, https://trafficel.ru/123?keyword=balsam+hill+coupons+discounts, suggests a potential lure related to coupons or discounts to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafficel.ru/123?keyword=balsam+hill+coupons+discounts PDF link annotation
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/xejuxineredumojozeba.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/7dc0ea71b02.pdfIn PDF document text
    • https://rofetavagamufup.weebly.com/uploads/1/3/4/3/134373504/2785844.pdfIn PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/timudu-jinorupozusa-pajima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_5fa59bc06e5c8.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/a56bf365842d09.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/1a26a.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/dawegazefomiji_korilozodev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_5f9267a6cc20c.pdfIn PDF document text
    • https://dibozavo.weebly.com/uploads/1/3/4/5/134501923/5729289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://forujutoko.files.wordpress.com/2020/11/157597504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d4d2a3-f8fc-4d45-898f-b4add7c40376/85281545946.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20551aca-4cab-4862-911a-fd50c8ba0f93/xekujefakemux.pdfIn PDF document text
    • https://vifuvux.files.wordpress.com/2020/11/tofumufepokipokuwoxi.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_off00006903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 5268 bytes
SHA-256: 2b3f3b9724b711ea337bc24aee292d652a4ce28a0d1cd72527ed92a78067e020
font_01_sfnt_off00007ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC3 11216 bytes
SHA-256: ec8f6e5598880052d4e462f81a1bf820783f960746e07641c239bf406aeb8b50

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