Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbadbc7d177d7ee…

MALICIOUS

PDF

38.2 KB Created: 2020-11-08 06:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 83e621f911e724a9d6e58f8a25416fc9 SHA-1: 181acf52fcc13209d1be5c9328b9df5de2e001dc SHA-256: 8cbadbc7d177d7ee0d4493ad768a82cfbd4ba866f08cd6bfbe76f90c7a801476
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirect to potentially malicious infrastructure, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a "gate opener manual", likely intended to trick users into clicking through to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=co-z+gate+opener+manual In PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/filosodofajuferotez.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/99d2d4351f6637.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/xazuz.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/0987a26ce10b.pdfIn PDF document text
    • https://sabovewedasujak.weebly.com/uploads/1/3/4/4/134493104/1698778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fajutavezuku.files.wordpress.com/2020/11/download_midnight_club_3_dub_edition_psp_highly_compressed.pdfIn PDF document text
    • https://wirejodumab.files.wordpress.com/2020/11/tiwaparamefoja.pdfIn PDF document text
    • https://zopagova.files.wordpress.com/2020/11/webepaxu.pdfIn PDF document text
    • https://nafitesizu.files.wordpress.com/2020/11/93228143481.pdfIn PDF document text
    • https://jemapuxepe.files.wordpress.com/2020/11/82009163745.pdfIn PDF document text
    • https://gobakige.files.wordpress.com/2020/11/writing_practice_worksheets_for_ielts_academic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a264720-6a98-4690-aab0-588ccfb0b5fd/vudukela.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/basics_of_biopsychology_pinel.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_off00005470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5470 4948 bytes
SHA-256: 4b30666f96faa2ca513e3b9a9df9d6b953a24b3d938d2f6259126077942c151d
font_01_sfnt_off00006540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 11328 bytes
SHA-256: ca2287b6ee74b2f31cffce15e80bf8ff62671a432fdf491e8aadccb2a6736e72

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