Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfdcb7a046dcc05…

MALICIOUS

PDF

45.2 KB Created: 2020-11-04 23:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f8a7b2a8b0c9ed7a8b6d17e8f3f94d09 SHA-1: 8967098feaa6c4353e11a6d51645c78c4c6ea7e8 SHA-256: 6bfdcb7a046dcc0592c4b50a10ab0b1fb47990d868ae771f4fc689b5f9bb2e91
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a suspicious URL, identified as a malicious redirector. This suggests an attempt to lure users to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the suspicious URL.

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://ttraff.club/123?keyword=buds+gun+shop+online+optics In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f956e74b5c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_5fa119867d0c8.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/9696971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8be4b20e805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_5f90dd95a310c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3831/7464/files/marijuana_legalization_iowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8e271d-e806-45a6-a931-1456a978ea5e/37164183842.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/honeywell_visionpro_8000_smart.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_off0000731e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731E 5076 bytes
SHA-256: 3b3920a62ac3713093ce2bd9bb7e4184f13edb360af019895bd69b17741e8e15
font_01_sfnt_off0000846c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846C 10520 bytes
SHA-256: 31e7f1f9f64667d1440c7c7def43cea66c15b7d167a2ba3047d99e28a738de09

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