Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8cf34f8d974473…

MALICIOUS

PDF

55.3 KB Created: 2020-10-30 20:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 68e853415f3de481b458452b9c8a0548 SHA-1: 262b8b7f1f5187279d8d9d93574860878b055359 SHA-256: 4c8cf34f8d9744739e4d0d58ebdb9975ed932c31d95f4c092a2062cf92fad08d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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=portable+literature+8th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f87aeecc5e13.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/1/0506/7948/0500/files/half_uncle_and_half_niece_relationship.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1412/2404/files/faradic_stimulation_physiotherapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335cd9a9-23b7-4479-bdc4-734105f14857/64913531813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de33a96-e29d-450c-a6bd-deefa06e7599/62875297347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7411/8334/files/lagadekuposabekav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb554c3-f3c3-44eb-b5e3-cdcc74048914/jones_farm_meats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7557/1364/files/textview_justify_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cec0563-d760-4067-ad05-1d051b40ff16/problemas_de_aplicacion_de_la_parabola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7882/1047/files/summary_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b53849-4d6b-4d99-96be-a769ebbf5b7e/96893356152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9894a4-895a-4d13-80a6-80ac05ee0bbd/dumukebisur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ba7d25-2f2d-44ac-bbc6-9f8bbbddebd5/60322926033.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_off00009890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9890 5284 bytes
SHA-256: dcbcce9d0caaae8cfcc117de72fa4fc9e1f6bca468c98db8a97d9371a077f418
font_01_sfnt_off0000aa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA78 11356 bytes
SHA-256: 8c0d4da8d63eb3909327d9eab3bb6f7cd002bde81ef644d9b5726a67cc3bea21

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