Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf85ff6ad557165…

MALICIOUS

PDF

51.4 KB Created: 2020-07-19 03:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 4b7a647d099b50c2745d74edbf73815d SHA-1: f16c23772b5a91bea04baae4d462b14130febeb4 SHA-256: ebf85ff6ad55716513bb6733f3e1c0e87c06b4923e16847526f83d1793ee1cee
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body text is heavily obfuscated and appears to be junk data, but the presence of the link farm and the malicious redirector strongly suggest a malicious intent to drive traffic to harmful sites.

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.ru/wb?keyword=use%20of%20marketing%20and%20sales%20information%20system%20pdf In PDF document text
    • http://files.isuministries.org/uploads/1/3/1/3/131398250/dakirofe.pdfIn PDF document text
    • http://files.uprowing.com/uploads/1/3/2/7/132740457/9368014.pdfIn PDF document text
    • http://files.jessiebrown.net/uploads/1/3/1/6/131637853/679592.pdfIn PDF document text
    • http://files.stealthbrew.co/uploads/1/3/1/0/131069992/gakomo-wawakoxi-xadowef.pdfIn PDF document text
    • http://files.lisaguice.net/uploads/1/3/1/3/131379085/09c663a493dcaa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sudomabu.files.wordpress.com/2020/07/mobabepisudatuvake.pdfIn PDF document text
    • https://defowem.files.wordpress.com/2020/07/ximitaga.pdfIn PDF document text
    • https://xoduwataneno.files.wordpress.com/2020/07/rogawibadezotubevuf.pdfIn PDF document text
    • https://bobovopesujo.files.wordpress.com/2020/07/vetatewagew.pdfIn PDF document text
    • https://mosamexi.files.wordpress.com/2020/06/56022102376.pdfIn PDF document text
    • https://dukidowa.files.wordpress.com/2020/06/68922866798.pdfIn PDF document text
    • https://dolajova.files.wordpress.com/2020/06/23570568815.pdfIn PDF document text
    • https://riwebaf.files.wordpress.com/2020/06/kaxizafaxovobotalabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/davixoligiwonosenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7351/9272/files/79312706371.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4781/3269/files/soponig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/27605774946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/45578840289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xagene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/20416539025.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_off00008b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0B 5304 bytes
SHA-256: f18bf236e3047f577648505f00d23852bea948bd6b48c74b6665d4a4dbf9ca62
font_01_sfnt_off00009d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D03 9960 bytes
SHA-256: 8776f10e99c033ab130eaa82d572a4ab2877ed7b513c59b072280543428c9de2