Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e89337b9be92f5…

MALICIOUS

PDF

36.9 KB Created: 2020-10-13 12:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 274f75b04cdb39d171c8d194e24b7f52 SHA-1: 666f910a5a37b4b7d0d49e5a6514a6b15ef5f501 SHA-256: 87e89337b9be92f58fcb1dec43f2032a013a8f9701bfe54746d131c84cd90ede
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to disposable hosting services and redirect to known malicious infrastructure. The primary URL identified, 'https://cctraff.ru/strik?keyword=tracheostomy+set+instruments+pdf', is flagged as a malicious redirector. The document's structure and content indicate it is designed to lure users into clicking these links, likely leading to further malware downloads or phishing attempts.

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://cctraff.ru/strik?keyword=tracheostomy+set+instruments+pdf In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vudodapazepipux_kijemomebegax_velagokotukif.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/jixidused.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.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/1/0481/8442/6645/files/latest_facebook_lite_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/oracion_de_perdon_y_arrepentimiento_a_dios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caf76df-2b6e-4d48-965f-aa51598f693c/10291353373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9329eaf-9485-4a72-9701-7d22d0aa1fd9/duzetigemuditunowosita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc251c53-ddcb-45a7-b22a-bf62fc739445/taruzipofuvavewifog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777aa62a-718a-4a5c-8b53-6cc13b7d435d/28487150852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec0c06a-9cd8-4d37-878d-c5644d39f772/69682011341.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_off00005218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5218 5416 bytes
SHA-256: 0a9eafbc9d844fd1847802b737c1eb4ed4e1cc1090928c09d8aab1e7fca26ea8
font_01_sfnt_off0000645f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645F 9980 bytes
SHA-256: c507470fd836c9ffa40cd1740e293fb30f0299a04b1892aadbeb609a1598ff76

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