Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4ef4438afc589…

MALICIOUS

PDF

45.7 KB Created: 2020-11-04 17:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a8a5d1989ebe70ed54f423017cfc3b8d SHA-1: 414ca43061f7a98ad420dee983dfc3f5e490011b SHA-256: 7ad4ef4438afc589d5e70e0df5c4d911d003739f10900b85eac5269198ae3183
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.me/123?keyword=classroom+that+is+conducive+for+learning In PDF document text
    • https://dipedupaketi.weebly.com/uploads/1/3/4/3/134333799/e273dd0cb633.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/rodulenab.pdfIn PDF document text
    • https://tekuximusiwax.weebly.com/uploads/1/3/4/4/134450812/kofogorajigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ebb8a9-d8a1-400e-8229-36d17727e021/duvavawilidozekeram.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/bakutulalulerilikuwavaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c8ba0d-9f98-445e-980e-d3a46def8207/28186723420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca9a49d-2c70-41ca-b24e-840c718b5a9a/the_secret_history_donna_tartt_beauty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2743e514-fd16-4881-9a21-3061e52d5c8e/caw_wwe_2k17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684013ea-88f8-4e6a-ade9-ddd781322056/51477525153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922d078a-3630-4b2c-875b-c8d47a3cb3c2/soxajapanemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339ddd6d-b8ec-4e54-a2c3-6062fb520114/vekizexogavivuvifulabosum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd25b14-8eef-4074-88bf-73b27ad0b497/rilomekanakaroseze.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/67419854589.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_off00007421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7421 5400 bytes
SHA-256: 4378c4bdb5d3ad3072a72a46bf78496fd4599f6a81cebdd2026c036c43bc9a66
font_01_sfnt_off0000865d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 10456 bytes
SHA-256: ef2faba10f85b5c0d2fa7fc2634de91f21868f5e524038f78e3a7fc665bdc248

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