Malicious PDF — malware analysis report

Static analysis result for SHA-256 371d4941f9100b78…

MALICIOUS

PDF

41.3 KB Created: 2020-10-11 06:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: eaf35196052b55ceb90b373e681beec3 SHA-1: 83108a1c5b8518ab68dee699b1678659235dba33 SHA-256: 371d4941f9100b78ba4ff14cbc347ae4dd955fd4d00baa0ab707c009cf369f21
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://gettraff.ru/pify?keyword=work+at+a+pizza+place+roblox+secrets In PDF document text
    • http://files.coachrenee2u.com/uploads/1/3/0/7/130738955/782ee15f104b.pdfIn PDF document text
    • http://files.kelsey-horner.com/uploads/1/3/1/4/131482832/bukezako.pdfIn PDF document text
    • http://files.ppgaacaernarfon.org/uploads/1/3/2/7/132740756/zizuzure.pdfIn PDF document text
    • http://files.ridgedogs.com/uploads/1/3/2/7/132712435/8582093.pdfIn PDF document text
    • http://zawuse.philvinson.com/uploads/1/3/2/3/132302936/7520675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/sierra_7_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3495/8753/files/park_jiwon_gif_icons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9462/5441/files/98820558093.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6633/8711/files/78333168438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12afec4b-7a44-4a3e-9f54-2466bfc857be/seleropijejam.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_off000063a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 5264 bytes
SHA-256: f9d72ee4e58d0bab0b3e702b9948aed2af8e2a5b3db05fa21f0bd3be928207c1
font_01_sfnt_off000075b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 10128 bytes
SHA-256: 4d06117e33300bdcc00e3f37a405931e6d8699fa2194722478d689dd7d0d9a76