Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da441cdc55e9f0d…

MALICIOUS

PDF

62.9 KB Created: 2020-11-08 12:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08794e57cdf0cd12c4c0e151f5f2a9d2 SHA-1: 8d4f079a45f5c43676497a229e4f3582d4e90773 SHA-256: 9da441cdc55e9f0da0af0d42170e0455695d236b19c381c40ec392c75a39c67a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains multiple links to a known malicious redirector. The document body, though partially corrupted, includes the URL 'https://ggtraff.ru/123?keyword=the+columbian+exchange+good+and+bad', which is also listed as a malicious redirector. The presence of numerous external PDF links, some pointing to benign content and others to the malicious redirector, suggests an attempt to obscure the true destination or engage in link farming for SEO manipulation, ultimately leading to a malicious site.

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/123?keyword=the+columbian+exchange+good+and+bad In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff7f07c-999b-4779-bba9-1e7c06e97de6/picacho_middle_school_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1632c1cb-2da7-4b0e-ad2e-5c2a6d6a92ac/51617175739.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/boards_and_beyond_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/3120067806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192b8553-c7be-4372-b5fa-890c8398ff2b/words_beginning_with_quel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f52068-a40a-45a4-8dba-4a922232a243/vufunisisefu.pdfIn PDF document text
    • https://gumomonixita.files.wordpress.com/2020/11/bivesosaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c764940f-236f-44c0-8d66-348c3c9c3525/nuwogosig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6a8a53-69eb-41f2-819b-07d0d8db3441/22452953110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f91b54f-55f9-4040-b286-ead4a1d074d5/bulasupivivevikujosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb5c1e5-0a6f-459d-8369-0a6be44c9902/after_effect_cc_2019_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97decdaa-4c77-45e4-a88e-203ad05283b0/communication_style_in_france.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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 5236 bytes
SHA-256: a5a6a7a7b2576256bd2ba03a92b03364dc1d1fb9c3bd99d3e3c1f1158d0818e9
font_01_sfnt_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 12848 bytes
SHA-256: 3072eb8ed5ca01efbefc73168d5f83877d8350aff84509c1414843a7dbba75d9

Open this report in the interactive analyzer, or submit your own file for analysis.