Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae4413874fed7b8…

MALICIOUS

PDF

42.6 KB Created: 2020-11-05 11:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 1f54a481f568f62f4981590f22594182 SHA-1: c7b4335b705c4e6769c1617f2680bcf94914d885 SHA-256: 3ae4413874fed7b8ff9e388eaea5eab814431ab26fcb9fd13aa436a251dcb8ff
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=phim+hong+kong+long+tieng+1986 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_5fa3bcce371bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5f9ec2a3bb7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5f95aa6ff1f8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8734bfca934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8860f36cf06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f8e6bffdb798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5f91ebdb58fae.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/liwafo/xumovomojug.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/76732026075.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/step_8_worksheet_aa_approved.pdfIn PDF document text
    • https://s3.amazonaws.com/kozikixoju/wefuvirazediwa.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/pewasogonagekekuwediw.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/67615451693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8140/9713/files/kali_linux_download_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/memusaselobeboniz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7111/7720/files/sebawen.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/22343331725.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_off000065c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C0 5236 bytes
SHA-256: 9889ff50b220a4e2e2c205242af3ab4b423bfd4f3cbabbfdb848d70e2e7b0eb8
font_01_sfnt_off00007775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 11012 bytes
SHA-256: 56b0fff6c38857e3ed09cf8e33181ae2b35e1ff3726c91dffa6be916ba4e1a89

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