Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5ee206a3ecc27d…

MALICIOUS

PDF

42.2 KB Created: 2020-11-01 23:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3731e3bde1a70d97dd3e676f3d5daccf SHA-1: 86489027e52b775fc5a687d1f04348ee6d07e037 SHA-256: bd5ee206a3ecc27d743b82362b3ce4602d24796d08d77b484d42ca3474fd98f2
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by multiple heuristics as a malicious redirector. The document body, though heavily obfuscated, contains the same redirect URL. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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/strik?keyword=watch+bravo+online+free+live+stream In PDF document text
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/8187166.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/4467144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5f9d7bcd370b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5f9686c923ba2.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/7519535.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/05be767d-1589-426b-9128-2d8ae0666c58/macross_delta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2250/4864/files/essentials_of_biology_lab_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0af4d9-967f-4f81-934e-9d44e2ad29c9/43743525344.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/45857219245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/6414/9168/files/doom_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad455c3-8835-4bd7-8721-4707183f8dd3/megavesezukixutijegeril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a78b95-de55-48c7-9f04-d961a760de65/jujelad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe67823-fac9-42f2-a2d1-3668a71f9b86/bugufetubegasolak.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/mozafilepin.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_off000064ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 5336 bytes
SHA-256: 805c9fff8aed4d2b626e89debb7168fa38692d3411dd7a36c88eb5d493e6717c
font_01_sfnt_off000076bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76BC 10960 bytes
SHA-256: 59b33d54eea1fe24cf45215cf5141c58249a02de708bd24fad9b147fd21806a1

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