Malicious PDF — malware analysis report

Static analysis result for SHA-256 63499493666939b3…

MALICIOUS

PDF

77.3 KB Created: 2021-01-04 03:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d92caab5c3df49f3f97fc62cea0dcbd SHA-1: 7cf2db9f7a020450dea87f0106ac2451b4b01c1f SHA-256: 63499493666939b3ddf0605ae54898872576d2b40030e5bf10a6561a44ac315c
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to a link farm designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL is known to be associated with malicious redirectors. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to the URLs, suggesting an attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=reverse+card+uno+hearts In PDF document text
    • https://cdn.sqhk.co/xewumoxu/jaggifE/9887227623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_5fd310a13936a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fada973dc443.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/9gegigf/arena_gymnastics_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5fc1864c30f65.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/KfZ1hi6/59246870293.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/hhchafa/wuxiaworld_rate_limited.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/fgchc9B/horizon_credit_union_macon_mo_routing_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_5fe77e4f0668f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f8fbbc6ccd73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471235/normal_5fed15dd227e5.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/97ae5f0f36d05b.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/d46c2383814717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/donake/22247626830.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 4896 bytes
SHA-256: 8805e38835bc7d8509e102a04c73f6edaa851c5cbfa697586f19ecbfd5359e7d
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10104 bytes
SHA-256: e51d32f4ff07641a17cde5e1922ed2c95a9106545800634186c3ad189555becd
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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