Malicious PDF — malware analysis report

Static analysis result for SHA-256 2235edfdaf4a4349…

MALICIOUS

PDF

47.3 KB Created: 2020-10-31 07:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 50c63dfff5b8c3c3b9fb0f3503a923c4 SHA-1: 800992586fc6db81be621764ac04354a1386c6de SHA-256: 2235edfdaf4a4349e87469494f4d6a829a74a5a2d5f9505296e93a2ba26e13b6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to a redirector URL, identified as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'middle school debate program'. The presence of embedded URLs and the heuristic firings strongly suggest this PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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://gettraff.ru/123?keyword=middle+school+debate+program In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5dc4425f-f29e-4c4b-9524-723abb4c29ca/12315919093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03825290-7a78-4d41-9ce3-a15fdb7c0cd6/45002664041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07adeeb2-947b-4347-b875-334269182966/91931602079.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/medical_term_for_cutting_into.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58794e1-5214-4973-babe-132eeb55aa8c/35278389549.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/the_anatomy_coloring_book_wynn_kapit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a99d45-858c-4c59-b76e-da9b05b21b63/juseberitokapipojab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca56def-ced5-45d6-9e80-ae65fd2207e5/61279508099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1742/1479/files/new_orleans_to_destin_by_boat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c953e77f-596e-4c26-a413-ba9944b01aab/kuniji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211a1dfe-6b90-487c-b584-1c82b299a33c/first_paragraph_of_the_declaration_of_independence_translation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4214/6984/files/lindt_advent_calendar_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b149741-f973-4041-b45d-3c48a529e0e0/xosugixa.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/dios_mio_ayudame_oracion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252e8a4b-bd06-495b-a266-d5cfb09355a8/83360023715.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2A 5316 bytes
SHA-256: f127c3c0f81cda378689db90af6b10147099a7fbeb6b8217eb70923b4c0f80b6
font_01_sfnt_off00007e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E34 10488 bytes
SHA-256: 63165ab43558b2de97fc1def4bd261127f536da31b886182baa4269d06515d30
font_02_sfnt_off0000a1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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