Malicious PDF — malware analysis report

Static analysis result for SHA-256 64be680fe844bcc9…

MALICIOUS

PDF

40.0 KB Created: 2020-10-16 01:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f032b62fd21e175ee8979a1ce06ca5a SHA-1: 618396e2842a4aebd894089ca322bb7869f1c380 SHA-256: 64be680fe844bcc9260007d2e10b178a7b78dbc1abebf2a6ce119e9477e3b850
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

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://cctraff.ru/pify?keyword=android+studio+arraylist+remove+item In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/6110827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8736b83f9f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f88d14ddbaed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f88cdc1b1a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f874727b963c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f8892e34baab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f8760cc3ebaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5f87c1e2d9b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8721318001d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f88be84bb78d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f88c444db4d6.pdfIn 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/1/0484/9313/3986/files/99607597475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7580/7648/files/subject_and_object_worksheets_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22e1c52-d014-41ac-b87f-38d31b0e0f2c/76625628953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd69c87-d62c-442d-82fe-71dcb7316b02/xabow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479ec56e-9eff-4d80-bf78-7b037a93fb36/5674375761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ce5c6b-d873-4ab8-a599-9d206b4a0001/mevaxejax.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_off00005db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB8 5124 bytes
SHA-256: 43eaf16df9a8a428bca1118362211056cdda10afda6d330ab03e34c90b820635
font_01_sfnt_off00006f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F11 10512 bytes
SHA-256: 910b6cbcf3ed25c10b9a1140d7822b56d84dff9b16b392c54c2366c97a2f4286

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