Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e3ce8877deaea7…

MALICIOUS

PDF

43.2 KB Created: 2020-11-04 22:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1c73b88fe712131737743fa0f1c85d9f SHA-1: 4e26a93f8cfb7e77eb9d5136f5187cd4b5b3bec3 SHA-256: 11e3ce8877deaea7764514b673cb089ed8fb556b6af41929d3783c93f0e20876
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and heuristics suggest a phishing lure for a "free PDF download" to trick users into visiting the malicious site. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=a+brief+history+of+humankind+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5f914eb11b8a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ditiruz/9779245298.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/napewowagolulidibozu.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/75902055861.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/java_swing_display.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9458/2469/files/manual_de_homiletica_basica.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/rigodelesavakim.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/tetegoradav.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/bluffton_middle_school_address.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/68244928682.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/91402397812.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA0 5428 bytes
SHA-256: 57843b191e4625763708fae4b04a69ca7b7d5765b9b45dee902ebda486c9b2f4
font_01_sfnt_off00006fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE9 9968 bytes
SHA-256: 54626595b674349eda62ca68c622ccc4aa063afbd9bb496c7c74fd39c45ea151
font_02_sfnt_off000091f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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