Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a089a4bdc1e379…

MALICIOUS

PDF

62.6 KB Created: 2020-10-28 18:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 876fb1091ffdcf6d52e976b0a3958503 SHA-1: e6fcba46fccad5511eb0fd74ebaa2b66b65d3f6d SHA-256: 33a089a4bdc1e379b3843e4a3540085b2dbe6ec54466a27c8e0f326cec4e9318
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL and numerous other links pointing to external PDF files, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=singer+finishing+touch+overlocker+review In PDF document text
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/9172943.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/1240458.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/nejulejupaj.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/9918155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/passagens_walter_benjamin.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/duzalolefumirabopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7603/2944/files/ludo_star_apk_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/jiduleguwidunotojoxok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2307/2921/files/ergoline_evolution_600_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78054a30-491d-45a9-8444-8c00cfff5dcf/20000745385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5775f444-5fa5-45bb-933a-a9631db4d208/tefojimotusiniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950cfbfe-390e-41a9-a412-2b09dc2a7259/ridujixalag.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/69733331057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/6962/9350/files/historia_original_de_la_bella_durmiente.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2153913c-81e3-499f-b0d2-c6ed77720d22/wifusefedavawufususumunif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9078/6469/files/vabupesuxebuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b2f55e-2b54-414f-956b-ab9e5616d210/41072499734.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7054/6614/files/swing_and_slide_turbo_slide_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4469/8272/files/dubowujenowajabizulop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5503403-d323-48c6-b7be-e26a9b5ddcf0/rebinola.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/astrology_books_free_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13645a5-0653-4421-a012-811a3d91613d/metodo_de_transporte_aproximacion_de_vogel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7787/0786/files/fluke_322_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2464/5272/files/iata_travel_agents_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3341/9162/files/nabojus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7448a4-e607-482f-a1d2-ed99aea1b447/86410426840.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_off0000b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB489 5252 bytes
SHA-256: 62f1f83d9f56148706bda95ec0660c07703e4abadaeb3b64f833fc341c4de1b4
font_01_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 11384 bytes
SHA-256: b4fba75e3d8bd7f96c4f69c7ed107ba727e7130a2035dd91fdd5283cdef81a6f