Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f7f5545fef121a…

MALICIOUS

PDF

42.5 KB Created: 2020-09-14 18:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: fa8c5ced1029689eacfc228e925bc2b5 SHA-1: 3c79ed53ea1e9705fcd5f58d00f89163e148e417 SHA-256: a4f7f5545fef121a0f3ccf023de700029dd61d61bcf66a714384ee6d74a1cc12
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.link/pify?keyword=pool+club+nashville In PDF document text
    • http://tebus.johnstonlurecompany.com/uploads/1/3/2/3/132303382/346009.pdfIn PDF document text
    • http://files.weichenecon.org/uploads/1/3/0/7/130776413/popiperude-buwaw-biliw-bidazijekapulo.pdfIn PDF document text
    • http://jopojak.laxkiwanis.org/uploads/1/3/2/6/132683085/2913876.pdfIn PDF document text
    • http://files.jacobezuidenhout.com/uploads/1/3/1/8/131871864/doxisitevosoduvolid.pdfIn PDF document text
    • http://files.sherpapackers.com/uploads/1/3/0/7/130740069/jaxijigizaluni.pdfIn PDF document text
    • http://letuwa.callihanenglish.com/uploads/1/3/1/6/131637352/giriguladewedat_monemamuruja_zilojenomijas_vixolireve.pdfIn PDF document text
    • http://rizel.saltspringislandlife.com/uploads/1/3/0/7/130739986/91f10cae9.pdfIn PDF document text
    • http://files.effinghamelementary.org/uploads/1/3/1/3/131383892/wurajedoj_kokog_xujikowabopezu.pdfIn PDF document text
    • http://xedevape.crushblingboutique.com/uploads/1/3/2/7/132710770/maxegugegiwota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/2486b5_b740877cb0994eaeb8b361dc30ce9064.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cfd0a_5a63239fe0d84ff9b50f2e2d1ea8adae.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b80405_77903eb9b5264a45bd404fc8bfbd2c4e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6846fe_07af9f5672c1444dab2de9a0381b0f63.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a76634_a10d158ab9da474cbfbb57fdd5ab338e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fd3290_5d00e4b9f36040a5bdaeb870a3e0e59a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/33c377_a3ece5c0840b4b0ab022b55b1ab4b3ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/370b54_fb6c0d2b20324dba80026c578b627154.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1f2214fddf9e40f7a60b0428f6b77bd5.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_off0000668f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 4992 bytes
SHA-256: ea337cc97965057956c322e979e68a8b2fc0f54735343e668b840c77de57440d
font_01_sfnt_off0000778d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778D 11420 bytes
SHA-256: 61bb46b10dfb37d4f68c0211f84164c9a70c10c835563542a8f42df4689cedb8