Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7dbc5258c531ad…

MALICIOUS

PDF

43.8 KB Created: 2020-11-02 05:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 78f715496f07282e1f801b8f1a31e971 SHA-1: e9585cbf7ad09ee6b53c4616b5888e0c4db7998c SHA-256: 2e7dbc5258c531ad7e6d17d885bc6172f0ae836312e2f9d196396166ed36b64b
194 Risk Score

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://ttraff.cc/123?keyword=social+studies+chapter+11+grade+5+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f93f8708c40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f90aa9361ff4.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.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/1/0506/5618/2470/files/tomijomesopufivuwof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2298c129-0a8d-49ac-a861-997383c0a4ce/ridigivurubeserakexikej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e6b5a9-904d-4da7-a10c-f205a81baa63/reteach_the_pythagorean_theorem_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b036ed-610c-43ed-92df-5aa354491578/koganavaziwifusetugora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f86820-01ec-48e2-a0a0-d4e06ff6363a/fairy_tail_episode_156_english_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f0a8c4-a2e5-4cfb-9646-c9ae99a9f50d/jitetozevezebaji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8714/8696/files/8768562831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195cd1fe-7833-44f5-88f7-39fbf5e4fcbd/gusazibudidelonibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d1af41-e709-4701-aeb8-c7139c20759f/77985406807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251ddd0e-3b3d-40f9-b896-3cfe7c459834/21957917003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/83022496302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b74f34-8cd9-403d-92e2-d743d58f3f4b/mechanical_eye_terraria_guide.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_off00006a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A58 5716 bytes
SHA-256: 31df8879163c08b9306d05de0575c81ad68eca56b438d25ccc8030d59db505fe
font_01_sfnt_off00007dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD3 10624 bytes
SHA-256: a752ccc8550438307a197bc9139dc9818f040364d34062322ea3e4125bd46d7f

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