Malicious PDF — malware analysis report

Static analysis result for SHA-256 a646c5d8713b06a5…

MALICIOUS

PDF

41.4 KB Created: 2020-09-17 22:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da527a744a29d107c0d9ad26db3ff7a5 SHA-1: b967706d5f4c3c3eb1ac065ff3695a0c43ba965a SHA-256: a646c5d8713b06a5cf058dd2bf81baba7e9978c07fd9e8e2d9a0c1dcb5a496ca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=bloons+tower+defense+5+unblocked+games+66+at+school', which is flagged as malicious. This suggests the PDF is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/wix?keyword=bloons+tower+defense+5+unblocked+games+66+at+school In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/36374657975.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/9906/1141/files/xosibamomowikatizosiga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/16349630988.pdfIn PDF document text
    • https://41b2fdac-5aed-4d54-871f-34ec7fa81a4b.filesusr.com/ugd/ce4b7c_143f130c39aa490999ccb15ae3ce024b.pdf?index=trueIn PDF document text
    • https://daa62ce1-57e9-4b29-ae92-e8092d091875.filesusr.com/ugd/5c9621_a607b15b210740bf87d2e7acccfc86b9.pdf?index=trueIn PDF document text
    • https://c9e5d6fd-ed14-4d2a-991a-029e61126a0a.filesusr.com/ugd/f35da0_4848b772dc954f34b16773820e7e9a0a.pdf?index=trueIn PDF document text
    • https://3a0745b2-97e4-481b-8673-d08e8f20365a.filesusr.com/ugd/86319b_fec61fd145b74ecfb7e9531763d88007.pdf?index=trueIn PDF document text
    • https://f8acd062-aa55-4524-9d9e-529753486a29.filesusr.com/ugd/5926b4_1e1fb7cdb32a4439b5ec92d185a46f53.pdf?index=trueIn PDF document text
    • https://aa33cf94-0855-4ed7-93be-fbfdfd66a9ef.filesusr.com/ugd/cf5aa9_215562771e514b39be1a35b396439bf9.pdf?index=trueIn PDF document text
    • https://e3f44d5b-f0d3-46ad-a67e-191f2d4beac0.filesusr.com/ugd/a86d68_c9257e2e75194f04957f2f2b228851a3.pdf?index=trueIn PDF document text
    • https://b28a23eb-1bc7-42fe-aff6-c99a24e3c441.filesusr.com/ugd/7a11b0_a723fd43bba9421c921842a37732fed2.pdf?index=trueIn PDF document text
    • https://9d045f7f-98ff-49d4-931f-ed58b37912b5.filesusr.com/ugd/b444d4_1a2255d68f7b413f9dfaa753720857e9.pdf?index=trueIn PDF document text
    • https://c852256c-c7bd-480e-aab8-1e0a8c52ee99.filesusr.com/ugd/70e5f7_1f91e027a6174f60a36187b67db38a4e.pdf?index=trueIn PDF document text
    • https://b1578003-f9a8-4f4a-a79e-92e87671fe3f.filesusr.com/ugd/d5cf39_193317edb896418fbe91c50b83aa7bd3.pdf?index=trueIn 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_off00006011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6011 6056 bytes
SHA-256: d90c2409e77a6b5534cf6871487a236f51208296fc8f5cdfebd1b5be52f9f4d8
font_01_sfnt_off000074a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A0 10628 bytes
SHA-256: 55bb6fca9115f98a176c820868697fc22703eeb3cba428ee2aee6d7ff56096c2

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