Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dfc71da66a4a26…

MALICIOUS

PDF

48.7 KB Created: 2020-10-13 01:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 20348402a1ad9bc4354adb00a3598376 SHA-1: faded63b5102fbb0acac10532423e111e76bd310 SHA-256: a5dfc71da66a4a267605ab2bfaab84c23870f72db42a4b66d2fe0a76674c2572
224 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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=rising+tide+society+gift+guide In PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/39156288593.pdfIn PDF document text
    • https://site-1038709.mozfiles.com/files/1038709/11288753049.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/35999983578.pdfIn PDF document text
    • https://site-1039703.mozfiles.com/files/1039703/3634688357.pdfIn PDF document text
    • http://files.5thstreetfinancial.net/uploads/1/3/0/7/130739564/8840780.pdfIn PDF document text
    • http://xuseribe.jonathanschofieldtours.com/uploads/1/3/1/4/131438164/5294306.pdfIn PDF document text
    • http://files.rhythmresearchresources.net/uploads/1/3/1/6/131606127/gelizoxi-mevep-xuzumifam.pdfIn PDF document text
    • http://dixabexo.danscaliforniapolicebadgesnpatches.com/uploads/1/3/1/4/131483067/kiduvazodak_gokemoputuga_mibuj_lixixojagina.pdfIn PDF document text
    • http://xifebi.mindspringhempco.com/uploads/1/3/1/0/131070858/b69b0a202.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9151/6310/files/alberta_outdoorsmen_fly_fishing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4433/4487/files/steve_o_book_barnes_and_noble.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2254/4807/files/cultural_anthropology_asking_questions_about_humanity_free.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_off0000817e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817E 4960 bytes
SHA-256: 604a9c601bcf94b06b572a053f4fb4bddfcfa8959c6768b91bc0e0425b478fe5
font_01_sfnt_off00009282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9282 10304 bytes
SHA-256: ed87b54b5a1f2e84be41db80d5d3a283896e29ee27e09840ed97213ccb58c8aa