Malicious PDF — malware analysis report

Static analysis result for SHA-256 422df700bd014dcf…

MALICIOUS

PDF

50.5 KB Created: 2020-10-12 08:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 39c516f6647f20f8e5a9ea92d1d4011a SHA-1: e7c370dfa8b641c22d937f67174ce0ca8f3926f5 SHA-256: 422df700bd014dcfe26449b9567c6049a48ae5a5c025985e3c017c70becd1073
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=mcdougal+littell+biology+study+guide+answer+key In PDF document text
    • https://site-1038322.mozfiles.com/files/1038322/valowimegolubebofejab.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/14628995991.pdfIn PDF document text
    • https://site-1039140.mozfiles.com/files/1039140/63148653239.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/zexowudobil.pdfIn PDF document text
    • https://site-1040766.mozfiles.com/files/1040766/61857986005.pdfIn PDF document text
    • https://site-1040373.mozfiles.com/files/1040373/fofetapedixejulave.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/96482589403.pdfIn PDF document text
    • https://site-1040096.mozfiles.com/files/1040096/99644931895.pdfIn PDF document text
    • https://site-1039965.mozfiles.com/files/1039965/55785175993.pdfIn PDF document text
    • https://site-1040177.mozfiles.com/files/1040177/66305634546.pdfIn PDF document text
    • https://site-1040668.mozfiles.com/files/1040668/44994560526.pdfIn PDF document text
    • https://site-1045392.mozfiles.com/files/1045392/nividopuga.pdfIn PDF document text
    • https://site-1039889.mozfiles.com/files/1039889/75371125295.pdfIn PDF document text
    • http://files.smamusic.com/uploads/1/3/1/4/131438847/0f87fce.pdfIn PDF document text
    • http://zapazu.sternarts.com/uploads/1/3/1/4/131406202/1631279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000085ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EA 5508 bytes
SHA-256: a73214cfb1d99e974ca97fbd198faaa29b2bca0ff7ca8f4be8e848f854434a7c
font_01_sfnt_off000098c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98C5 10960 bytes
SHA-256: 942844a33bd83d225e565344a4e574e999c22d7d49242f97d8f0628983d5ab45

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