Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc717d0760de889…

MALICIOUS

PDF

35.5 KB Created: 2020-11-04 14:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a65566f20dabbfe144897ffb2b48a436 SHA-1: 30dae5405e884a5da8d7cacb1b8efe553a810d0f SHA-256: cfc717d0760de889b830dcc5782ed67e95b391ab2d37f212021a036261190388
134 Risk Score

Malware Insights

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

The PDF contains a link disguised as a service manual download, which redirects to a malicious URL. This is a common tactic for phishing or scam operations. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains a link pointing to a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=dodge+durango+2012+service+repair+manual+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f8b987e0b559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5f9a14b535956.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f908fcee2dd8.pdfIn PDF document text
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/jawujumawoma_kiteluvuruzod_pazadebufu_gusevolapofem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_5f926f162c3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5fa08ebb688e3.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/3e740e2f-dac5-44bf-8b35-f70ba4fd063e/13537575466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ef773c-79c9-4feb-aebf-fcd56178efad/recipes_no_sugar_no_carbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07beff63-d3cf-40b8-9644-008a3c076ed5/jibexakulifafevelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f937f655-36a6-4adf-88bd-f9b18e123e1f/pefafuv.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/sifidirixupavexaru.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_off0000499b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x499B 5860 bytes
SHA-256: 099b5c7af7c6ae77e4b4e0730cf6d3585952ad0e9fbe383ced88af1e5e52daa3
font_01_sfnt_off00005d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 10376 bytes
SHA-256: 95b769f49163403ce115f442f42032eae03a53d1117cb5a322576538af975970