Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad40aaf015dd035…

MALICIOUS

PDF

77.5 KB Created: 2021-01-06 05:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ddc6155ee9860787323924a969ec1caa SHA-1: 25fbe51bb70c4e07ee8c2ec769b6fa17c6a16e0b SHA-256: fad40aaf015dd03547ad5c74c5aa4c5278d22cd863dddf5ab3679f56d4fcc4d4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed to distribute malware or phish users. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it redirects to known malicious infrastructure. No scripts were extracted, but the overall structure and URL findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=bonfire+heart+sheet+music+pdf In PDF document text
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/732728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fcbabe75648f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5fe4efb616ae4.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/F9ILhhL/92072427536.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/T2zriy6/download_my_talking_pet_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_5fad116f581ae.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/nisowofova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f87344e35930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3fb7c6-67b8-4b1b-82a0-8f3b565536cb/friends_til_the_end_chucky.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/nirawop.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/multiplication_worksheets_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19e2a18-44a7-4203-9238-63872d7e53ee/mcconnell_brue_flynn_macroeconomics_19th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/pidefira.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/guided_reading_activity_year_3.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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5412 bytes
SHA-256: 401b6032f3585238c15bfe2c04f980705ac44cba872918b01059458e4a5e7b82
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 10480 bytes
SHA-256: 2175bda894813d5f174a44560744c05dbb4dcb5af9b94ddd4b863d2425ed5920

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