Malicious PDF — malware analysis report

Static analysis result for SHA-256 866d1f80e2ceae0e…

MALICIOUS

PDF

43.7 KB Created: 2020-10-07 18:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4108fbf6080d79aa675e6076d59b0c69 SHA-1: 7c34e61089cc690d8c50ad074b0c9add7a562f2a SHA-256: 866d1f80e2ceae0ec5913ab151ce5bc9a8243a9563a57db7fc300b7302df876e
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution.

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://cctraff.ru/strik?keyword=contoh+past+perfect+continuous+tense+active+dan+passive In PDF document text
    • http://files.unityofheartfalmouth.com/uploads/1/3/0/7/130738719/varuvinetuzawonajuge.pdfIn PDF document text
    • http://files.qfcreation.com/uploads/1/3/0/7/130739719/zitudi.pdfIn PDF document text
    • http://files.acrossthecreekorganics.ca/uploads/1/3/2/8/132814250/jadovojenadowawu.pdfIn PDF document text
    • http://files.mowmylawnonline.com/uploads/1/3/0/7/130775969/39394aca.pdfIn PDF document text
    • http://galeza.powerofmath.net/uploads/1/3/1/3/131379478/2050617.pdfIn PDF document text
    • http://files.missmatchmakerlive.com/uploads/1/3/0/8/130874231/7718408.pdfIn PDF document text
    • http://rusez.geraldineandnicholas.com/uploads/1/3/2/6/132681824/wiwepul_zumurepijogu.pdfIn PDF document text
    • http://lepeporo.urbanedenbeauty.co.uk/uploads/1/3/1/4/131413418/5711969.pdfIn PDF document text
    • http://files.stonypointfarm.com/uploads/1/3/2/6/132680827/dabesubufomafalugibi.pdfIn PDF document text
    • https://site-1042666.mozfiles.com/files/1042666/38266370841.pdfIn PDF document text
    • https://site-1043216.mozfiles.com/files/1043216/seworikan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6750459c-1b15-4655-80a9-b67219d7f283/turuloximufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2722adb1-447e-461d-a24c-90bd16db29d4/guwusoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5584b23a-91af-438d-8d42-5e691ad7fedb/8833840539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4be064-c0d0-467c-8872-10c694548711/kipewozegot.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_off00006d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 5176 bytes
SHA-256: a52a2035c3b600d98568fa5138eea722a7746e38805d6dccaf0b54d60188a092
font_01_sfnt_off00007f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 10028 bytes
SHA-256: 93d56bc1a9b8bac1b01a8b9a870b77dbf62ab0c1ce0b74dc7ef63e0de6f6c4e8

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