Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1c1a1f2441745e…

MALICIOUS

PDF

55.0 KB Created: 2020-10-27 05:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a428db616ac6bd51ec8df2f90b76e60 SHA-1: 4ad798998e1378f546c3a30ffe2861675c00296e SHA-256: eb1c1a1f2441745e432ce1d7b1e4c680cb7b45fc8b8a75b75c8e07d15ec2ddb8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.link/123?keyword=cry+baby+janis+joplin+meaning`. Additionally, it exhibits a PDF link farm behavior with numerous external PDF links, suggesting an attempt at SEO manipulation or a large-scale redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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.link/123?keyword=cry+baby+janis+joplin+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f897c88593d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f8929839424e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f87d0b0e28d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f8ce1b53f41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f96866eb96e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5f964895db3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5f9763cbf0530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8758e53080d.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/63dba5a1d.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/25a5b073710f894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_5f91da71d5a2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f86f65dc4114.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/bc89299ad2.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5f8ec37d59532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8754f7a446d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000893f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893F 5360 bytes
SHA-256: 942dfc2c0e0123ba9324ad271f218a010356dd6352f30b7acd8bc01ec67db1c5
font_01_sfnt_off00009b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B68 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000a6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6CC 11468 bytes
SHA-256: c037186911335c9e6eef1ce6292921fb644f70b44e06c59b028a38d47af98a99

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