Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0fbb8f1e4c119e…

MALICIOUS

PDF

52.6 KB Created: 2020-11-03 11:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c41b28cb09745290afdb0cae630c069b SHA-1: d8827f3ea6c64c423d946b4d63433b65dac2488e SHA-256: fa0fbb8f1e4c119e46e9976127d153fa2409616e6ffd4adc12380344d3a69502
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.cc/123?keyword=naruto+amv+come+closer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5f9d2815c1575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f8965319047b.pdfIn PDF document text
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/8642367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/06010251-1d3d-4d83-a2bd-e80e2bc0a8f8/76477214548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7735f21-7355-46b5-9b27-625912bc78fd/57077577506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bc166f-6629-43f6-8300-c40334d3ac42/bajimenivub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61f1cc8-98ce-43a5-8d67-0bea7305ba32/batch_xpediter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/ruzefesemubetezabozuwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616199cd-db1a-4306-bc5f-0316afe28c9a/73150194759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e244e0-e14a-4496-90ca-6484883f603f/vezuvawozefigixe.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/19th_amendment_to_the_constitution_sinhala.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/hypersonic_aerothermodynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40162786-7771-4146-989e-edbe7666e05b/vagejadipuwelokuzojom.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/do_baby_sharks_have_tongues.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/58913634450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5299 19832 bytes
SHA-256: 9bb76b6f00581f89fe273b3a147f92d0181fe0e31ece2fbdd821e5d24469b5a3
font_01_sfnt_off0000913a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913A 4972 bytes
SHA-256: 947d3514b8dfe4cbbefe3d4cf3597830c71122d5a5d176b45e358711ac47f5a5
font_02_sfnt_off0000a219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA219 10512 bytes
SHA-256: 65787857dc0a6ba3e6a9dbb0cb48bd92de46def88c1fc5f16c378479d7464b35

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