Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf77dde933871669…

MALICIOUS

PDF

41.6 KB Created: 2020-10-02 01:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2920f727af045382d60e0cc3884a599f SHA-1: ed886276470adf5cfcff6bd7ee9aec48fa218302 SHA-256: bf77dde933871669b78e214285f0f34522deb7cab5b1497e1b7de8a1db80ab73
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious due to its function as a link farm and redirector. It contains numerous links to external websites, including one identified as a malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that likely serves as the initial lure, directing users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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=direct+speech+to+indirect+speech+examples+with+answers In PDF document text
    • http://tolele.theoldvicarageburley.com/uploads/1/3/1/6/131637136/0e6aaa6718.pdfIn PDF document text
    • http://files.downrivermortgageone.com/uploads/1/3/2/6/132696113/torinotenupixokeg.pdfIn PDF document text
    • http://files.weareawebsite.com/uploads/1/3/2/7/132740285/vaxipijuwo.pdfIn PDF document text
    • http://pexabasex.alanahardmanphotography.com/uploads/1/3/0/7/130740019/2760257.pdfIn PDF document text
    • http://zerugafab.salvatoremallimopiano.org/uploads/1/3/1/4/131407405/283502157a.pdfIn PDF document text
    • http://dulabab.red2green.org/uploads/1/3/0/7/130776818/2017afd.pdfIn PDF document text
    • http://pajokiro.clarknorthart.com/uploads/1/3/2/6/132681910/donupirekuzufaj-mabajiximerudek-mufilas.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/1/0437/4183/9514/files/dolby_atmos_apk_for_android_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/73819361105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/what_was_the_main_food_source_for_the_northwest.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1338/2044/files/browns_seafood_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdd58ac-c346-4c3c-aa77-35834712ed3c/mawofupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b0029c-da40-4180-9a60-499f31dbd461/40132135248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f017900-27e7-4d49-92d3-1ec26447c39f/68028618036.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_off0000649c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649C 5472 bytes
SHA-256: 0632d31335b51c278b4f8bd481e0592f94fd5375f4975985d470624ccfd29b76
font_01_sfnt_off00007728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7728 9884 bytes
SHA-256: 307262bf611878a7aa1ce15f6da74e511ba5328dea93b75f7ace192f287be934

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