Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8021beb0d183eb…

MALICIOUS

PDF

42.0 KB Created: 2020-10-28 03:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ecbed2e76ed3fcbf2d20b12b78b39f9a SHA-1: 303a72d39224f43e084322cab402009dc416978d SHA-256: 2f8021beb0d183ebdcac38d5c3db007515383503e5c8f2df783b32590e73877b
102 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure, possibly related to academic material to entice clicks.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.link/123?keyword=clyde+pharr+vergil%2527s+aeneid+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f8b35e194d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f89d34d32fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f874ad2b7723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_5f97c683dcffc.pdfIn PDF document text
    • http://www.bolchazy.com/Vergils-Aeneid-Books-I-VI-With-Introduction-Notes-Vocabulary-and-GrammaticalIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/98763364194.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/15267228801.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/convert_to_word_online_nitro.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/apicultura_organica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c499ea4-d8fd-48c3-8a74-57557d36f75e/duwubotiregezofin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14379edd-8789-444d-b301-00a4ea99a9ca/54700109061.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/figo_cervical_cancer_staging_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/applied_pharmacology_in_anaesthesiology_and_critical_care.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/21339377866.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kizezofebolorabajokofiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d05d962-8553-48d5-9e59-39ece67054ae/food_packaging_principles_and_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e04892-1e94-42af-9d8b-be8cec8c8a59/xaxuvodepuzevudimupafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f27631-73d9-467e-b576-ff908bd34c3b/9277349947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5944929-b4f7-4a42-860f-fdfdbbb11796/bawafisatuxolizukuvosa.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/acknowledgement_receipt_format.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/bluefish_editor_tutorial.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_off00006148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6148 5404 bytes
SHA-256: f08a34b4ccfef87da928d798b72a7bf89d0f5cd62c109760f1a5eedc8fb212c5
font_01_sfnt_off000073b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 11296 bytes
SHA-256: 8276546e45f2b4602123a308d5f769b0303df903a0647eed6ad95c5d44779f91

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