Malicious PDF — malware analysis report

Static analysis result for SHA-256 53973979f58598a3…

MALICIOUS

PDF

44.2 KB Created: 2020-10-07 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ffd2225ba853959ac5998a8a6ee72686 SHA-1: 914f2c907fffd9523759d87c8bd4b95348f2641a SHA-256: 53973979f58598a301452af08d94e0abfa2cc4b4d83f1720d25eda79f15c5e2b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1200 Hardware Add-in

The PDF file contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm. One URL, https://gettraff.ru/pify?keyword=singer+sewing+machine+manual+free+pdf, is identified as a malicious redirector. 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 phishing sites.

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://gettraff.ru/pify?keyword=singer+sewing+machine+manual+free+pdf In PDF document text
    • http://files.jakemasritattoo.com/uploads/1/3/0/7/130740374/togarovefirokezorifo.pdfIn PDF document text
    • http://kibodur.gutsfrisbeearchive.com/uploads/1/3/2/8/132814930/nawumelawopik.pdfIn PDF document text
    • http://xuvos.launch-studios.com/uploads/1/3/0/7/130775726/lukevularosemo.pdfIn PDF document text
    • http://files.theoldoilhouseboscastle.co.uk/uploads/1/3/1/8/131856564/zawawegusu_naloviwuk_tixowiso.pdfIn PDF document text
    • http://files.estefancy.com/uploads/1/3/0/7/130775727/c1616.pdfIn PDF document text
    • http://files.playmusiccompany.com/uploads/1/3/1/4/131483343/xurepu.pdfIn PDF document text
    • http://files.tillsounds.com/uploads/1/3/0/8/130813601/5415065.pdfIn PDF document text
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.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/8d032850-1734-4dd2-b119-fbae84514f31/rujenulejizoragoditu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7809/3462/files/urea_to_ammonia_conversion_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0054/8504/files/gulidamomab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6474/1025/files/topographic_map_worksheet.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_off00006c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C92 5764 bytes
SHA-256: a8f390c1de6369aa8038855161402218d3206ca92a1586f5c1ace3e560114e1a
font_01_sfnt_off0000801f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 10484 bytes
SHA-256: ace7cda0e895475406232703bada2739e9724d51a437e847fc87cb609774b6ed

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