Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d23475d4c6393e…

MALICIOUS

PDF

69.6 KB Created: 2020-10-02 18:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b49d9a9beae53ae5c362d25a29f57973 SHA-1: bedd473cdfccb5a225c668b09ae9baa2164a446b SHA-256: e4d23475d4c6393e2ceb83825fbb7e0607d5bedf0bdc8b70382bade7d140ac70
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 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 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=libro+ejercicios+gramatica+espa%25C3%25B1ola+pdf In PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/metefiladekamalinikafis.pdfIn PDF document text
    • https://site-1040319.mozfiles.com/files/1040319/tamajigurapar.pdfIn PDF document text
    • https://site-1039226.mozfiles.com/files/1039226/fazevarego.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/1/0481/7161/4375/files/naruxevota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4226/3199/files/58025628344.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/total_drama_eva_elimination.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/effects_of_industrial_revolution_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/bovago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/final_fantasy_xiv_shinryu_extreme_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3679/3237/files/death_race_the_game_3_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8270/3257/files/28200941597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/tafudosapap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1187/2667/files/nucleus_622_cochlear_implant.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/abrahams_family_tree.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_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 5844 bytes
SHA-256: 862529a4219dd1fc49359dc40d06b4fd5b5677c2d0f433937102f430045e7aff
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 11796 bytes
SHA-256: 9ab7d5098273b2ee9c6fb7f50fbe5ad6041d647c157111051ff30bebceb4fd4c

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