Malicious PDF — malware analysis report

Static analysis result for SHA-256 b616d665a6911c49…

MALICIOUS

PDF

54.8 KB Created: 2020-11-05 18:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 42a7e5a110c00c76cf5a405fe1b8b53d SHA-1: d605a095b33e30053158024452ac4006f1534727 SHA-256: b616d665a6911c491c1245dc49c3a6f0e82d165637ed55c25710b9d5cafca510
154 Risk Score

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://ggtraff.ru/123?keyword=lower-division+academic+course+guide+manual In PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/kemojigogujav_sabiji_zeweduv_koterugijiverun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5f93af1397c57.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/f735e99b9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5fa28748742aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f8856438c7f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f8f5abdc81e1.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/3870745.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/dawam_dalexiveba_xasatujivawo_warefozi.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/38e4aa1d-5a90-4caa-9bf2-e26ce970de50/66802794685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63dfd1e-608b-4121-8b41-d48456658dbb/gta_rp_glitch.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/kajal.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_off0000981f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x981F 5384 bytes
SHA-256: 55907e7968a13757b688cee5ed7b6a8d8f1d396d0470eb52f6753edaa8eaa450
font_01_sfnt_off0000aa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA73 10564 bytes
SHA-256: 1a4b8d8f2399c15bd7de640f6ab216df4495a866a80d8790c91d5c3ce0d686d7