Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd70a90093eee942…

MALICIOUS

PDF

45.7 KB Created: 2020-11-06 20:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: ff83992b2c1f8d026317f258c05aaf4e SHA-1: 098d260cde14fcd6987a7c325d1afc4480b99ac2 SHA-256: cd70a90093eee942f7969ca6e1b4682766dad0dd5fda1c8cb1bde4da5ef0cd60
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffking.ru/aws?keyword=functional+vocabulary+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87045aa759c.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/fobikoxubij_xuvuxajetowa_ganijijesapan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8b2eaf1c960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fa4b95441f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f99b3dd76b07.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/mexugep_tisumu.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/ganapivebefemivube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tulosa/260453824.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/84952042070.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/sorcery_gamebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/33255169127.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_off000072fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 5300 bytes
SHA-256: 4c2ef0012c294e984e3256d3dbac949adb1c1ad4f5c9a10862683c6f5e0644d6
font_01_sfnt_off0000851a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851A 11060 bytes
SHA-256: d96811c7611f5f53346660c5db8102f1418fd024a86b24c050e9cf551a8bba1a