Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa90c15b4946f9dd…

MALICIOUS

PDF

36.4 KB Created: 2020-11-06 19:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 033e2ab6de3a8b98666fb4c758ea2d03 SHA-1: 9c8f7e50ff587443309d77208d033136421711b2 SHA-256: fa90c15b4946f9dd5c07d12e325a39494cd10e861bad475cd3a0dae986aea660
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://cctraff.ru/aws?keyword=uccs+unofficial+transcript In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f95c98dcb8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5fa3796a4d1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f86f493d1ecb.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/ce6e1f3a8e12371.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/a7648cc7-6451-45f4-b87d-a0ead65fff28/zetiwuwerobanex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93dc35b0-4674-4e5b-94c5-25c831d46758/75056963107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2a0782-5e77-4c31-916e-eb4c220a2694/69259302238.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://ririvolo.files.wordpress.com/2020/11/romancing_mister_bridgerton_free_download.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/togenodemevek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcdcaea7-e574-4f30-a6bd-f821d50be8bc/webivuvararipopan.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/252119708.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_off00004f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F54 5000 bytes
SHA-256: 46fcf5ae25f2a523c2d09effc2d649d45b07db2ec083febc5f40aa0661e9c598
font_01_sfnt_off0000606c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 11028 bytes
SHA-256: 816dc794c35878ec7b055225b26b2f369bde5fa23a91f2fc162311d4f7624012