Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab659dc738af895…

MALICIOUS

PDF

40.5 KB Created: 2020-10-29 15:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: bf6a1284624aa46abf1e2cb8e975abce SHA-1: c99688d5760dbcc15377089527fe98dfcd862772 SHA-256: aab659dc738af895f573176140218e0c5c9f052e3bb7a90a0b41e9ae7ab91b5e
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://ttraff.me/123?keyword=southwest+baptist+church+fort+myers+fl In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_5f94b31a1968a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5f9990d5e34d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3267/7022/files/sazapagadifepumin.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/wokiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/nulubod.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/muraruzujavikosufexid.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/dobefekufeligena.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/jizifupesositezopafuzilut.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/divopezeserekug.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/37753328151.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6F 5468 bytes
SHA-256: 0a83ac1a2c4f5d5c2bf97e99761b6ef32c32577d7c1271cf67a6e2b5fdfdd86d
font_01_sfnt_off00006226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 11304 bytes
SHA-256: ad04b29583fd6f13d7611287daf8e7008cddd4396523189711202705f9ee6c04
font_02_sfnt_off0000877a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x877A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333