Malicious PDF — malware analysis report

Static analysis result for SHA-256 3396899eb03d1155…

MALICIOUS

PDF

43.5 KB Created: 2020-11-01 20:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 724f604a75fa8a4d7800e80fe645206c SHA-1: b8feac6870b388a61248fdcdb12353da5e51c85c SHA-256: 3396899eb03d1155f6c72a46d31eb02f202042674d53fa143cd26da184b062cd
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the redirector link suggest an attempt to lure the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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.
  • 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://gettraff.ru/123?keyword=fe+scripts+op In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f9883b7144fd.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/1003190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f891c5f0f8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_5f9d2e4bf1272.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/lakadutof/samsung_security_system_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f31ef5-4afd-4a45-b8ac-9933dcd792cc/mechanics_of_materials_beer_and_johnston_7th_edition_solution_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4750/1983/files/21624462312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022c536d-3215-4141-8fab-83b0b2ef2d00/naruto_shippuden_episode_102_english_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/bargain_news_ct_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/71272288855.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/purutikegan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13755d79-a0e9-469b-8983-0cccb7281812/free_cna_practice_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/pagubeniguwax.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_off0000554b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x554B 4640 bytes
SHA-256: 6c5586956c5efae3fc4d2a2d72d320123a40788de01db5872b170f3e372ef4bf
font_01_sfnt_off0000652b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652B 11416 bytes
SHA-256: b6308519b41a227bf7cbcc1b9ecceb208b2a0f960499d6671116aba2045ba308
font_02_sfnt_off00008bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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