Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bd7e0477b1aa9d…

MALICIOUS

PDF

44.0 KB Created: 2020-10-23 06:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e18d4207391403b51583fea14e072763 SHA-1: 7a7d2f8f3dbc993f355d9165d0548d5ebe5f1e6c SHA-256: 65bd7e0477b1aa9d7ac26d19f5c6e664808f1d193b3bd9e8048b5b0c951e0584
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of many external links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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://ttraff.ru/123?keyword=evaluate+the+algebraic+expressions+worksheet
    • https://cdn-cms.f-static.net/uploads/4390381/normal_5f8f93f052876.pdf
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8f99984229c.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f874b0d05c80.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/podamavivarer.pdf
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/5635707.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/bojab.pdf
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/zuzedakeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/09cd2a9e-e246-41a3-b1b2-b4bd63a826fe/chimera_jailbreak_download_ipa_1.2.5.pdf
    • https://uploads.strikinglycdn.com/files/ba94a485-a58a-4ed1-a667-94389cbd6e9b/52511754848.pdf
    • https://uploads.strikinglycdn.com/files/430beedf-315d-41a7-8b51-6f5b8d14633e/bozerolokomoxanokalakiwu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6077/1481/files/breville_pie_maker_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0503/0563/0404/files/mucinex_600_mg_dosage_instructions.pdf
    • https://uploads.strikinglycdn.com/files/4093b7a3-f433-497c-b711-69d6850f643f/32704924730.pdf
    • https://uploads.strikinglycdn.com/files/334c370c-1ca8-44b1-b46a-6dea555b7633/slime_rancher_food.pdf
    • https://uploads.strikinglycdn.com/files/c07b01dd-5f76-4910-b09a-e2271862fe78/vajigobuvosa.pdf
    • https://s3.amazonaws.com/mijedusovineti/4550690880.pdf
    • https://s3.amazonaws.com/mijedusovineti/dibokopupolasab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a61.bin
c1401460c2ad774afa5dfcce6a09ec580692f6af18a6026a02320ed76f8d0983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A61 5576 bytes
font_01_sfnt_off00007d69.bin
3999d0331d7c4d17574315cc33e3d0b141ce49b8c7142e60833b610d90325506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D69 10260 bytes

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