Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ac4bef52668010…

MALICIOUS

PDF

44.8 KB Created: 2020-10-28 09:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: feea3aa1e1d76c91cb4cbd59080ac675 SHA-1: d4ae17ff1202def235c4676067fdcedc7debce74 SHA-256: 37ac4bef52668010737f7a75b4183860398e43c11dd4678a33a68085436213bc
134 Risk Score

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.
  • 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=2007+ab+calculus+free+response In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f98a708335d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f8e7132e801a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5f9135e1ee0d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f89b2730b356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f8aba5a7a178.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/xozeb/learn_portuguese_download.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/51006471715.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/bafiwuper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbaf97dd-9f90-4b59-9ee8-49b568ea710e/40444891823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f188e4-cb23-47f4-8403-b4eb85437c8c/matenezumiwegozive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7612b5-fc68-41e4-aceb-2b73bf96dcad/70310689196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f87bf4f-3553-4a51-b75d-acf12faadf1c/37116478279.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/hunger_games_full_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/saude_e_meio_ambiente.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/pure_and_applied_additional_mathematics_sixth_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/7640446945.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/bacterial_genome_sequencing.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/zawupexamaferufe.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/batman_vs_superman_comics_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/68503073593.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/academic_writing_useful_phrases.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/tajawujawaxopoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/burglar_s_guide_to_the_city.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57BD 5408 bytes
SHA-256: d5035112aa3d2729e96e8929345aeeff1908f1013497a0c0f912f76964b65d29
font_01_sfnt_off00006a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1F 11900 bytes
SHA-256: 2f616f8021339bcbec6593934e5175d057ff1de3948a2f233860e68d1880b7a0
font_02_sfnt_off00008eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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