Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd05987b9d10d8ea…

MALICIOUS

PDF

45.5 KB Created: 2020-09-30 01:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: bd9ec3addae4004ac05a561acf0bc96c SHA-1: 3c26f31226f6c3cbca5c59844e71b3e66c2988c6 SHA-256: fd05987b9d10d8eab059bce2761f0e90dba498f8669cf159ec1731ea7c12bb3c
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=simple+present+tense+pdf+exercises In PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/12326292124.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/pisoselimifudojipul.pdfIn PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/35677660954.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/12585701946.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/58455439826.pdfIn PDF document text
    • http://labaxis.lshb.org/uploads/1/3/1/3/131384403/7983506.pdfIn PDF document text
    • http://files.starcraftpontoons.com/uploads/1/3/1/8/131856108/20de7e096f1cd6d.pdfIn PDF document text
    • http://files.leisure-studio.com/uploads/1/3/0/9/130969798/daribuseta.pdfIn PDF document text
    • http://files.natalie-coppola.com/uploads/1/3/0/9/130969440/6e28f16e83e0e4.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/75592384303.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/31359085223.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/icici_forex_rate_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/mokoradafoxumidixove.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 5260 bytes
SHA-256: 4ae9bb34bf33ff23d9d2ce067536abbf305aa82404f77dc65266ee51af4d388e
font_01_sfnt_off000071a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 7524 bytes
SHA-256: 1a8dd41cdd3aa2a974e0c63b7df9d8e42a035cdf93fa6ac3e14e16694087d644
font_02_sfnt_off0000861f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861F 10028 bytes
SHA-256: e40bc0a52d855623d2edd951c82fb53071941e345c3370f48cc0046d12e37d83