Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a08a5815a9a275…

MALICIOUS

PDF

45.7 KB Created: 2020-10-02 04:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2358e4b06f683c0da7fa4d4332d7421a SHA-1: 1833efd00c038885838b03b4726f10d2f0629db3 SHA-256: f1a08a5815a9a27592b0eb9dacbd0e1500bcf7ee60d864bb844459bf2155a2e6
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/strik?keyword=momofuku+cookbook+pdf+download In PDF document text
    • http://files.augustinepotter.com/uploads/1/3/2/7/132740186/9c20167749ae3.pdfIn PDF document text
    • http://files.cadalinascreativecasa.com/uploads/1/3/0/8/130814914/1529070.pdfIn PDF document text
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/34755095704.pdfIn PDF document text
    • https://site-1036684.mozfiles.com/files/1036684/83952741061.pdfIn PDF document text
    • https://site-1039301.mozfiles.com/files/1039301/34219307162.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/60357557688.pdfIn PDF document text
    • https://site-1039775.mozfiles.com/files/1039775/gawuniz.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/1/0431/1908/3677/files/paul_ossmann_sharon_reed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c35a71-ab63-4a46-a61c-6a83b466d273/fiteneden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04dd7619-a14e-4551-9fe9-0513ccad70ab/47492992881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bf2b38-961b-4260-89fb-30c3e7ef5bdb/sokowizemisimadojevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5199304-006d-4624-973d-331cf3d4019e/6663262516.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_off0000739f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739F 5328 bytes
SHA-256: 223f529eb5bdce00b53e6b28b420c94c1b7c20946ae54448dc4f212bf4432210
font_01_sfnt_off000085d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D1 10624 bytes
SHA-256: ac9704bf5ae1ae24d1f2ae20cecfd46a77bfe61bf08a662555c5e6755a0a952c

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