Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913cddc994e78ae…

MALICIOUS

PDF

44.2 KB Created: 2020-11-06 01:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: ad9529937c279d422607e5acf9a5151f SHA-1: 5caec477eeecb4dc25d6f949834bfa628ba8a017 SHA-256: c913cddc994e78ae33bc109632df37751de9defb2506bb007b0771204cc4abd6
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?keyword=number+games+for+preschoolers+printable In PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/1f51c1e0f1051c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f976dfe742ad.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/sikagivuv.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/5654442.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/nasujotater.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/azoospermia_y_oligospermia.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/gm_repair_manual_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c677804-8a81-44c4-aea7-bf66c4570bee/el_hombre_ms_rico_de_babilonia_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb59cc0a-ecc7-467c-af40-70456389af99/19885210812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9a7add-dbbf-4f0f-be0e-f746ba756eb0/26157545201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5701c6-9e83-44a9-8518-c6de95d93530/89782381336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae8a0a8-7cb6-4e4a-970c-09973caccbc4/4420593644.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_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5536 bytes
SHA-256: d1e4c6085fef80fd2f3703deee612e706388dfeffde3f9f2cb72044d79d557fd
font_01_sfnt_off00007f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F08 11072 bytes
SHA-256: 97e916da5af79bd23557b00122f01afe1795feb85fdbfa76d46a33abd8f7e9b1

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