Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abecec4d7f833d6…

MALICIOUS

PDF

35.5 KB Created: 2020-10-10 14:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f6551d75f9f71a816078818381972643 SHA-1: e18a2adeb9fae334b17b8c690e93cb9b6fed4515 SHA-256: 9abecec4d7f833d6e61babad174958c5af1cbd619abaafe9c0f33627be12f277
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://ggtraff.ru/strik?keyword=the+health+care+handbook+free+download In PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/45524651454.pdfIn PDF document text
    • https://site-1048479.mozfiles.com/files/1048479/32698288333.pdfIn PDF document text
    • https://site-1042968.mozfiles.com/files/1042968/tugad.pdfIn PDF document text
    • https://site-1039861.mozfiles.com/files/1039861/jijufu.pdfIn PDF document text
    • https://site-1037074.mozfiles.com/files/1037074/41729480346.pdfIn PDF document text
    • http://kowoliwo.carnegiepresby.org/uploads/1/3/2/7/132710624/vezurekuriv.pdfIn PDF document text
    • http://files.artfulbarb.com/uploads/1/3/1/3/131398108/7227987.pdfIn PDF document text
    • http://robuwi.motherlodemusicalmarin.org/uploads/1/3/2/7/132741066/1065239.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/1/0497/4195/5221/files/66037782751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/9232/6808/files/8181920665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/latino_health_paradox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9721/8467/files/alaska_aviation_weather_unit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6388/1115/files/zelodigoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b8ed82-3043-4146-a2c1-8e6f7f2b414d/majex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654937c2-c257-438e-b13b-3a0d2c41abaa/17599110866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391da516-5f88-4067-a816-0a9fda66caa3/redidanifisetolevoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e544711-309b-4eae-8566-92f1e64fc95b/2731518010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b8c6d8-886b-4240-a89c-3ab509310c24/bawularudusewojexoxukom.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_off00004e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E09 5176 bytes
SHA-256: 412d70b9fd94505067ba8689a18096ffe743f183257ddcf804edfcf1c677694f
font_01_sfnt_off00005fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAE 9684 bytes
SHA-256: 40beab6a5230c189263b98708aa0b065282b8499f4123bec4814a32dae8f853e

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