Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3325278b36e632f…

MALICIOUS

PDF

69.4 KB Created: 2020-11-23 18:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6ac1fcc177e8df51f6f7008413ed94d9 SHA-1: db62d05fdedb2363ca1e31bb5a0288a0ccaff233 SHA-256: b3325278b36e632f552891dcff595b9341a2e1c1ac5f2962bea3b5dffbac0a21
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://traffine.ru/strik?utm_term=peliculas+completas+de+gaston+santos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f86f96134dae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f8be5e371003.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/boposevepago.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/d64661bcc1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5f8f011d43821.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/1d92dec5-a31d-45bf-be09-8b4f88c5d519/bill_cipher_cosplay_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9abad9-640b-4dfc-b471-71a7029adc93/18596697339.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/24808654087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fa7dee-639c-47b1-9120-96e854bfb3b3/28242698390.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/celebrate_good_times_instrumental_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a7dbe39-8530-4258-b5d7-2244036a1e28/spongebob_song_jellyfish_jam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f50e7cb-9a93-4e53-aa1d-6dffdcfa276c/major_ian_thomas_the_indwelling_life_of_christ.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7477a89e-4cb7-4f99-a4f4-a187cdeb7072/readers_digest_songbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ce1a7f-1ab5-4351-9ebb-acbe73376b17/wigitasepuruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5417bb1c-04dd-4315-bef7-725529324b0b/69341367462.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_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 5300 bytes
SHA-256: 40f0d0b39f9475575a6f1248dc3fb9bc17888d7f501ebea34e390b1cc738389c
font_01_sfnt_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 12156 bytes
SHA-256: db4f6fac32338641171f004801b7c7e8611b12eaa599bc308922c50581bb88f8

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