Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a2e9a7c5922c89…

MALICIOUS

PDF

86.6 KB Created: 2020-10-17 12:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 369f3eefd558dcf2fe205a8796f12756 SHA-1: 5348c0bdfe4ab8b6b5f8c57c875f620e7a5e60cd SHA-256: c5a2e9a7c5922c8943a7d76101f8c95cac29c053e33ca435d71d3792ce32061e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ggtraff.ru/strik?keyword=ejemplos+de+fermentacion+alcoholica In PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/4584302.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/2f0c6c825dc18fa.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/1313875.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/fefugige.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8a21628541e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f874619d03a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5f8abbcebb6d8.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/xufitakikili.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/1/0266/9579/4857/files/beste_taschenrechner_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2341/4942/files/7678838929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9982/2520/files/39208470661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/oxford_spanish_dictionary_full_4.3.069_apkdata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/nsa_code_of_conduct.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3253/8009/files/sijirebomunikusomolipelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/marks_and_spencer_baby_shoe_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5992/7448/files/walgreens_blood_pressure_cuff_directions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4447/3498/files/full_screen_picture_caller_id_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9823/3760/files/typing_master_10_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80f11cd-2f87-4dd4-83b0-0192a9544a48/kudaxafujipasalikajeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ec60c2-0ce6-4b65-b551-bcf9da31b3a1/fojokosularejuxebituje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69978d86-fc56-4ec7-ab6a-40135b7389ed/lebumopopinizebanugewapat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c685078-7d8f-498f-b2b7-8b662ddaac58/zuwuzukur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ec0b26-caa1-4daf-a6b4-894225d086cf/93200755910.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 2896 bytes
SHA-256: 32d4891461d6d9e2fccd1e6a13731fd4d183e8714b28e9d89bdc0bd6551577e9
font_01_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 5428 bytes
SHA-256: d62e82426ff5a54f90a227d57333afcfe55f4c0e9ed7ca23cff723a13f765631
font_02_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 11892 bytes
SHA-256: 406ff17980a72603b6e107529aa9f29c9303e409cb7129e41f7e610d3518826b