Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c789d685fce6edb…

MALICIOUS

PDF

35.6 KB Created: 2020-10-03 23:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a2da09067b1b972c86137b14c065c05 SHA-1: 517a2ba2e33d8b2929f899c1dc997d9c11b56234 SHA-256: 5c789d685fce6edbfeadcadc778ddae2d062dba039d1901ca34e3c8084367d49
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to a 'study Bible'. The primary malicious action observed is the redirection to the URL https://cctraff.ru/strik?keyword=b%25C3%25ADblia+de+estudo+nvi+pdf, which is likely part of a phishing or malware distribution campaign.

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=b%25C3%25ADblia+de+estudo+nvi+pdf In PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/lonisamabivinejisepubez.pdfIn PDF document text
    • https://site-1040391.mozfiles.com/files/1040391/10906186866.pdfIn PDF document text
    • https://site-1038789.mozfiles.com/files/1038789/kuxifuzidagojagagifi.pdfIn PDF document text
    • https://site-1036635.mozfiles.com/files/1036635/7568826777.pdfIn PDF document text
    • https://site-1043321.mozfiles.com/files/1043321/puzenaw.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/topoxodevazadegagim.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/mamewapifepipiv.pdfIn PDF document text
    • https://site-1039409.mozfiles.com/files/1039409/kipumipolokakegavaz.pdfIn PDF document text
    • https://site-1037172.mozfiles.com/files/1037172/govitumizutedapuxuja.pdfIn PDF document text
    • https://site-1039898.mozfiles.com/files/1039898/12243119782.pdfIn PDF document text
    • https://site-1038970.mozfiles.com/files/1038970/35800846548.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/80062280228.pdfIn PDF document text
    • https://site-1036691.mozfiles.com/files/1036691/fiwaneveronotivatesuk.pdfIn PDF document text
    • https://site-1036753.mozfiles.com/files/1036753/73628565313.pdfIn PDF document text
    • https://site-1038312.mozfiles.com/files/1038312/gusidajawuzigulifufakuk.pdfIn PDF document text
    • http://files.khuloudkonsultancy.com/uploads/1/3/0/8/130874614/3861489.pdfIn PDF document text
    • http://files.gingerfitspo.com/uploads/1/3/1/3/131380550/ac579169ce3f299.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_off00004af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF9 5240 bytes
SHA-256: ba493b0d05ea5b020f06552384159d40b695aae29013bc817102fd6ffbc202c4
font_01_sfnt_off00005cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEC 11388 bytes
SHA-256: 64939b447041d57b74da42ed7910b698c29159dc0184a8566d507a5e9b67b85e

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