Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79ef054d28679ff…

MALICIOUS

PDF

71.5 KB Created: 2020-10-11 18:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97b0f73f28e9feae133a42d46169711f SHA-1: e6a69ae7b1f578ce2fec2cfcd45baa9df48ed514 SHA-256: c79ef054d28679ff4b3efd6c448302e109904cfc3e554bfff05e1256d0f36dc0
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure and other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/pify?keyword=crx+b20+swap+guide'. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, potentially leading to further malicious content or exploits.

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/pify?keyword=crx+b20+swap+guide In PDF document text
    • https://site-1043245.mozfiles.com/files/1043245/goxepej.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/14969591193.pdfIn PDF document text
    • https://site-1037902.mozfiles.com/files/1037902/7538105903.pdfIn PDF document text
    • https://site-1038299.mozfiles.com/files/1038299/rejovitomekopikobazulume.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/giganavete.pdfIn PDF document text
    • https://site-1039785.mozfiles.com/files/1039785/8611345116.pdfIn PDF document text
    • http://meropanu.ifacsta.org/uploads/1/3/1/0/131071041/fajofofesu.pdfIn PDF document text
    • http://vezazovi.barbarafoxartstudio.com/uploads/1/3/1/8/131856772/fizove-fukusajesukomu-watotawaweka.pdfIn PDF document text
    • http://files.meadowsterrehaute.com/uploads/1/3/2/6/132696174/garono.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/1/0476/5152/0678/files/dead_trigger_2_hack_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0638/5568/files/getogujavuzeluz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0360/1049/files/79770561720.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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 5576 bytes
SHA-256: ff90d470a8eaff2c208274b307b72c78d1f4d6da9becb0f8e593e6c7780adfa1
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 10804 bytes
SHA-256: 13b17fcf24837d73ef82f1954a27d3306aa9c4c19b13d78388a1b63a6a1c59b7

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