Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4af580b6fc36f5e…

MALICIOUS

PDF

40.7 KB Created: 2020-10-12 13:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: e0891645486a5e5a3123f7cf14b054d2 SHA-1: 4944611c03fe88a9194ba54e7640d735775f5cca SHA-256: a4af580b6fc36f5e624e5e3276ad0e7f82ddfc9291d44d72acc3de31cb316c3f
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://ttraff.club/pify?keyword=picsart+premium+version+apk+download In PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/18632656417.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/36175451292.pdfIn PDF document text
    • https://site-1038454.mozfiles.com/files/1038454/lorusodavenam.pdfIn PDF document text
    • http://files.popular-collectables.com/uploads/1/3/0/7/130776099/6992597.pdfIn PDF document text
    • https://site-1038556.mozfiles.com/files/1038556/94401721143.pdfIn PDF document text
    • https://site-1042541.mozfiles.com/files/1042541/botubagadarisujuvoduge.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/dovut.pdfIn PDF document text
    • https://site-1038600.mozfiles.com/files/1038600/fulokubikulafadoro.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/b3e7e3ae-d900-427c-8300-4d14c6e3a2f0/39889376464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a3fc61-12ae-4e9e-8758-7d81dba9b75d/24873919303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd417165-4b88-4919-a490-97e991578787/49651179676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8004ba83-a755-4458-80a0-217c29fafbcd/63698462395.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_off000060c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 5436 bytes
SHA-256: bb7f084fcc913b67d0353cfdcab1049d27dc85cf74684dde0051396bc9555748
font_01_sfnt_off0000733d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733D 10180 bytes
SHA-256: 72926aa87055c93080f5fc43698d339ba3e319226ecca6a31a115f9542c63fe3