Malicious PDF — malware analysis report

Static analysis result for SHA-256 433cf93a16a29011…

MALICIOUS

PDF

55.0 KB Created: 2020-11-01 17:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0c14ae9adf36bac30181d62d0e174806 SHA-1: 2a6cb1e0660e875831a7eac29ecce129c70ea067 SHA-256: 433cf93a16a29011824d88b2c9fe52ea0ef9075ff74c3d637c7d2031c3125884
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=wallace+township+pa+ordinance In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5f975f5decd3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f8f9abb4bc8e.pdfIn 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/15c099fe-e051-4f71-921b-36871f00ab22/41684936565.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/98742708021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c17dac-d66f-43f2-b6c0-b7db2ccacc88/jinirogilabepaluja.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/flutterbye_fairy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/palm_beach_boat_club_membership_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/22613695168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def38681-a938-4940-9b3f-cc31cdceb044/8924908618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5a4afc-00e0-47fe-ab4b-2474d2040fb4/redenuziravotelunigugin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebbe6c9-2892-4e5f-907c-38e2a7ae6ce9/redukesutipepogepuxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/wugupupefo.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_off000097ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97ED 5264 bytes
SHA-256: 3623ed1353f5ebaa4fdf881c35773d145f5172f11358d8682247c2daab3ffa22
font_01_sfnt_off0000a9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E1 11152 bytes
SHA-256: affbb8f5dfa7647716bb89bed1ddb620628f0919a5345ac0ca7c3532dc750914

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